TY  - CHAP
AU  - Milivojević, Sanja
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Milica, Ilić
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7093
AB  - Water hammer in two-phase systems, induced by direct steam condensation on subcooled water or by separation of subcooled water column, results in the most intensive pipeline pressure surges. Amplitudes of pressure spikes along the course of these dangerous transients strongly depend on the condensation and evaporation rates. The present paper provides a literature overview of thermal-hydraulic models for the prediction of water hammer phenomenon in two-phase systems, together with an original mechanistic approach for the prediction of phase transition rates, based on the shape and size of vapor-liquid interfacial area and the phase transition potential expressed through vapor and liquid phase temperature difference. Available water hammer experimental conditions were numerically simulated with the new modeling approach. Driving parameters of boiling and condensation rates at the steam-water interfaces are evaluated, and a good agreement is shown between numerical results and experimental data of bulk two-phase flow parameters during water hammer transients.
PB  - IntechOpen
T2  - Advances in Boiling and Condensation [Working Title]
T1  - Boiling and Condensation in Two-Phase System Transients with Water Hammer
DO  - 10.5772/intechopen.110122
ER  - 

@inbook{
author = "Milivojević, Sanja and Stevanović, Vladimir and Petrović, Milan M. and Milica, Ilić",
year = "2023",
abstract = "Water hammer in two-phase systems, induced by direct steam condensation on subcooled water or by separation of subcooled water column, results in the most intensive pipeline pressure surges. Amplitudes of pressure spikes along the course of these dangerous transients strongly depend on the condensation and evaporation rates. The present paper provides a literature overview of thermal-hydraulic models for the prediction of water hammer phenomenon in two-phase systems, together with an original mechanistic approach for the prediction of phase transition rates, based on the shape and size of vapor-liquid interfacial area and the phase transition potential expressed through vapor and liquid phase temperature difference. Available water hammer experimental conditions were numerically simulated with the new modeling approach. Driving parameters of boiling and condensation rates at the steam-water interfaces are evaluated, and a good agreement is shown between numerical results and experimental data of bulk two-phase flow parameters during water hammer transients.",
publisher = "IntechOpen",
journal = "Advances in Boiling and Condensation [Working Title]",
booktitle = "Boiling and Condensation in Two-Phase System Transients with Water Hammer",
doi = "10.5772/intechopen.110122"
}

Milivojević, S., Stevanović, V., Petrović, M. M.,& Milica, I.. (2023). Boiling and Condensation in Two-Phase System Transients with Water Hammer. in Advances in Boiling and Condensation [Working Title]
IntechOpen..
https://doi.org/10.5772/intechopen.110122

Milivojević S, Stevanović V, Petrović MM, Milica I. Boiling and Condensation in Two-Phase System Transients with Water Hammer. in Advances in Boiling and Condensation [Working Title]. 2023;.
doi:10.5772/intechopen.110122 .

Milivojević, Sanja, Stevanović, Vladimir, Petrović, Milan M., Milica, Ilić, "Boiling and Condensation in Two-Phase System Transients with Water Hammer" in Advances in Boiling and Condensation [Working Title] (2023),
https://doi.org/10.5772/intechopen.110122 . .

TY  - CONF
AU  - Ilić, Milica
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Milivojević, Sanja
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7090
AB  - This paper deals with current status and possibilities for feasible improvement of the flexibility of power generation fleet consisting of aged coal-fired power plants and hydro power plants. The analyses are done by use of well-established deterministic metrics - the normalized flexibility indicator for each power unit is evaluated accounting for ramp up and ramp down power rates as well as the unit operating range. The method is applied to the case of the Electric Power Industry of Serbia (EPS). As expected, hydro power units are highly flexible with normalized flexibility indicator reaching the values as high as 0.78 (on the scale from 0 to 1). The units in power plants fired with lignite are of low flexibility - especially the units with the greatest power where the flexibility indicator is well below 0.2. This issue can represent a serious constraint for operation of these units in conditions of variable demand and future implementation of renewable energy sources with intermittent power generation. 
In units of lignite fired power plants the operating range (formulated as difference between maximal and minimal net electric power) is a stronger limitation than the value of ramp up / down rate. Therefore, the efforts for flexibility enhancement focus on lowering of minimal or increase of unit maximal power. In literature various technical measures are considered for this purpose. Despite their undoubtably positive impact, some of these measures (for example, implementation of additional boiler or replacement of thick-wall by thin-wall parts) would represent such a drastic surgery for the aged lignite fired power fleet that they cannot be considered as feasible. For that reason, we analyse sophisticated technical measures which contribute to flexibility increase, but do not require too high retrofitting costs. The solutions are based on (i) advanced operational procedures for feedwater redistribution (ii) installation of additional economizers for recovery of flue gas heat and (iii) implementation of steam accumulators.
PB  - Beograd : Društvo termičara Srbije
C3  - International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. november 2023.
T1  - Flexibility of power generation and possibilities for feasible upgrades of coal power plants: a case of the Electric Power Industry of Serbia
EP  - 435
SP  - 426
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7090
ER  - 

@conference{
author = "Ilić, Milica and Stevanović, Vladimir and Petrović, Milan M. and Milivojević, Sanja",
year = "2023",
abstract = "This paper deals with current status and possibilities for feasible improvement of the flexibility of power generation fleet consisting of aged coal-fired power plants and hydro power plants. The analyses are done by use of well-established deterministic metrics - the normalized flexibility indicator for each power unit is evaluated accounting for ramp up and ramp down power rates as well as the unit operating range. The method is applied to the case of the Electric Power Industry of Serbia (EPS). As expected, hydro power units are highly flexible with normalized flexibility indicator reaching the values as high as 0.78 (on the scale from 0 to 1). The units in power plants fired with lignite are of low flexibility - especially the units with the greatest power where the flexibility indicator is well below 0.2. This issue can represent a serious constraint for operation of these units in conditions of variable demand and future implementation of renewable energy sources with intermittent power generation. 
In units of lignite fired power plants the operating range (formulated as difference between maximal and minimal net electric power) is a stronger limitation than the value of ramp up / down rate. Therefore, the efforts for flexibility enhancement focus on lowering of minimal or increase of unit maximal power. In literature various technical measures are considered for this purpose. Despite their undoubtably positive impact, some of these measures (for example, implementation of additional boiler or replacement of thick-wall by thin-wall parts) would represent such a drastic surgery for the aged lignite fired power fleet that they cannot be considered as feasible. For that reason, we analyse sophisticated technical measures which contribute to flexibility increase, but do not require too high retrofitting costs. The solutions are based on (i) advanced operational procedures for feedwater redistribution (ii) installation of additional economizers for recovery of flue gas heat and (iii) implementation of steam accumulators.",
publisher = "Beograd : Društvo termičara Srbije",
journal = "International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. november 2023.",
title = "Flexibility of power generation and possibilities for feasible upgrades of coal power plants: a case of the Electric Power Industry of Serbia",
pages = "435-426",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7090"
}

Ilić, M., Stevanović, V., Petrović, M. M.,& Milivojević, S.. (2023). Flexibility of power generation and possibilities for feasible upgrades of coal power plants: a case of the Electric Power Industry of Serbia. in International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. november 2023.
Beograd : Društvo termičara Srbije., 426-435.
https://hdl.handle.net/21.15107/rcub_machinery_7090

Ilić M, Stevanović V, Petrović MM, Milivojević S. Flexibility of power generation and possibilities for feasible upgrades of coal power plants: a case of the Electric Power Industry of Serbia. in International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. november 2023.. 2023;:426-435.
https://hdl.handle.net/21.15107/rcub_machinery_7090 .

Ilić, Milica, Stevanović, Vladimir, Petrović, Milan M., Milivojević, Sanja, "Flexibility of power generation and possibilities for feasible upgrades of coal power plants: a case of the Electric Power Industry of Serbia" in International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. november 2023. (2023):426-435,
https://hdl.handle.net/21.15107/rcub_machinery_7090 .

TY  - CONF
AU  - Petrović, Milan M.
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Ilić, Milica
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7091
AB  - Potential for the waste heat utilization in coal-fired thermal power plants that are in operation for a long period is reflected in an increased temperature of the flue gas at the exit of the regenerative air heater. After a long period of operation, the flue gas temperature exceeds the design value and is around 170 °C. In thermal power plants where a flue gas desulphurization plant has been built, the flue gas must be cooled at the absorber inlet to approximately 70 °C due to the efficiency of the desulphurization process, and thus the waste heat is irreversibly lost to the environment. Given the large temperature difference between the flue gas temperature at the boiler outlet and the temperature at the absorber inlet, as well as the large flue gas flow, there is a significant potential for the utilization of this waste heat. This potential can be used to heat the condensate from the steam power plant condensate line, where due to reduced steam extractions from the low-pressure turbine, the unchanged steam unit power is maintained with the lower fresh steam flow rate or the production of electricity increases without additional fuel consumption. The paper presents a technical solution for the utilization of waste heat in a low-pressure economizer at the 350 MWe lignite-fired thermal power plant. The energy balancing of the steam unit with the installed low-pressure economizer was performed and the increase in net unit efficiency was determined by applying the described solution in relation to the design conditions. It is shown that the net efficiency of the steam unit increases by 1.06 percentage points. About 73 GWh of electricity is produced by the flue gas waste heat utilization, which gives an annual reduction in coal consumption of approximately 98,000 tons, as well as an annual reduction in CO2 emissions of approximately 72,000 tons.
PB  - Beograd : Društvo termičara Srbije
C3  - International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. November 2023.
T1  - UTILIZATION OF THE FLUE GAS WASTE HEAT BY THE LOW-PRESSURE ECONOMIZER AT 350 MWE LIGNITE-FIRED POWER PLANT
EP  - 680
SP  - 675
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7091
ER  - 

@conference{
author = "Petrović, Milan M. and Stevanović, Vladimir and Milivojević, Sanja and Ilić, Milica",
year = "2023",
abstract = "Potential for the waste heat utilization in coal-fired thermal power plants that are in operation for a long period is reflected in an increased temperature of the flue gas at the exit of the regenerative air heater. After a long period of operation, the flue gas temperature exceeds the design value and is around 170 °C. In thermal power plants where a flue gas desulphurization plant has been built, the flue gas must be cooled at the absorber inlet to approximately 70 °C due to the efficiency of the desulphurization process, and thus the waste heat is irreversibly lost to the environment. Given the large temperature difference between the flue gas temperature at the boiler outlet and the temperature at the absorber inlet, as well as the large flue gas flow, there is a significant potential for the utilization of this waste heat. This potential can be used to heat the condensate from the steam power plant condensate line, where due to reduced steam extractions from the low-pressure turbine, the unchanged steam unit power is maintained with the lower fresh steam flow rate or the production of electricity increases without additional fuel consumption. The paper presents a technical solution for the utilization of waste heat in a low-pressure economizer at the 350 MWe lignite-fired thermal power plant. The energy balancing of the steam unit with the installed low-pressure economizer was performed and the increase in net unit efficiency was determined by applying the described solution in relation to the design conditions. It is shown that the net efficiency of the steam unit increases by 1.06 percentage points. About 73 GWh of electricity is produced by the flue gas waste heat utilization, which gives an annual reduction in coal consumption of approximately 98,000 tons, as well as an annual reduction in CO2 emissions of approximately 72,000 tons.",
publisher = "Beograd : Društvo termičara Srbije",
journal = "International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. November 2023.",
title = "UTILIZATION OF THE FLUE GAS WASTE HEAT BY THE LOW-PRESSURE ECONOMIZER AT 350 MWE LIGNITE-FIRED POWER PLANT",
pages = "680-675",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7091"
}

Petrović, M. M., Stevanović, V., Milivojević, S.,& Ilić, M.. (2023). UTILIZATION OF THE FLUE GAS WASTE HEAT BY THE LOW-PRESSURE ECONOMIZER AT 350 MWE LIGNITE-FIRED POWER PLANT. in International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. November 2023.
Beograd : Društvo termičara Srbije., 675-680.
https://hdl.handle.net/21.15107/rcub_machinery_7091

Petrović MM, Stevanović V, Milivojević S, Ilić M. UTILIZATION OF THE FLUE GAS WASTE HEAT BY THE LOW-PRESSURE ECONOMIZER AT 350 MWE LIGNITE-FIRED POWER PLANT. in International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. November 2023.. 2023;:675-680.
https://hdl.handle.net/21.15107/rcub_machinery_7091 .

Petrović, Milan M., Stevanović, Vladimir, Milivojević, Sanja, Ilić, Milica, "UTILIZATION OF THE FLUE GAS WASTE HEAT BY THE LOW-PRESSURE ECONOMIZER AT 350 MWE LIGNITE-FIRED POWER PLANT" in International Conference "Power Plants 2023", Zlatibor, Serbia, 8-10. November 2023. (2023):675-680,
https://hdl.handle.net/21.15107/rcub_machinery_7091 .

TY  - JOUR
AU  - Stevanović, Vladimir 
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
AU  - Ilić, Milica
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4441
AB  - The analysis of pressure changes in water and steam flow along the entire once-through steam boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic resistance was recorded in comparison to the design values in the evaporator tubes, both in the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner wall of tubes. The significantly increased absolute roughness on the inner wall of tubes was determined on the basis of measured pressure drops at sections of the tube system and numerical calculation performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube flows. The model is based on the steam-water two-fluid model with mass, momentum and energy balance equations and mechanistic correlations for the steam-water interface transfer processes. The model is suitable for the single and two-phase flow parameters prediction in the span from subcritical to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight in the fluid pressure, velocity and temperature change in the boiler tube system. After the long operational period the pressure drop in evaporating tubes almost doubles in comparison to the design values. The presented results are a support to boiler's design, operational procedures and maintenance.
PB  - Elsevier
T2  - Case Studies in Thermal Engineering
T1  - Increased hydraulic resistance in tubes of once-through boiler due to fouling: A case study of 650 MWe ligite fired unit
IS  - February
SP  - 102706
VL  - 42
DO  - 10.1016/j.csite.2023.102706
ER  - 

@article{
author = "Stevanović, Vladimir  and Milivojević, Sanja and Petrović, Milan M. and Ilić, Milica",
year = "2023",
abstract = "The analysis of pressure changes in water and steam flow along the entire once-through steam boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic resistance was recorded in comparison to the design values in the evaporator tubes, both in the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner wall of tubes. The significantly increased absolute roughness on the inner wall of tubes was determined on the basis of measured pressure drops at sections of the tube system and numerical calculation performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube flows. The model is based on the steam-water two-fluid model with mass, momentum and energy balance equations and mechanistic correlations for the steam-water interface transfer processes. The model is suitable for the single and two-phase flow parameters prediction in the span from subcritical to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight in the fluid pressure, velocity and temperature change in the boiler tube system. After the long operational period the pressure drop in evaporating tubes almost doubles in comparison to the design values. The presented results are a support to boiler's design, operational procedures and maintenance.",
publisher = "Elsevier",
journal = "Case Studies in Thermal Engineering",
title = "Increased hydraulic resistance in tubes of once-through boiler due to fouling: A case study of 650 MWe ligite fired unit",
number = "February",
pages = "102706",
volume = "42",
doi = "10.1016/j.csite.2023.102706"
}

Stevanović, V., Milivojević, S., Petrović, M. M.,& Ilić, M.. (2023). Increased hydraulic resistance in tubes of once-through boiler due to fouling: A case study of 650 MWe ligite fired unit. in Case Studies in Thermal Engineering
Elsevier., 42(February), 102706.
https://doi.org/10.1016/j.csite.2023.102706

Stevanović V, Milivojević S, Petrović MM, Ilić M. Increased hydraulic resistance in tubes of once-through boiler due to fouling: A case study of 650 MWe ligite fired unit. in Case Studies in Thermal Engineering. 2023;42(February):102706.
doi:10.1016/j.csite.2023.102706 .

Stevanović, Vladimir , Milivojević, Sanja, Petrović, Milan M., Ilić, Milica, "Increased hydraulic resistance in tubes of once-through boiler due to fouling: A case study of 650 MWe ligite fired unit" in Case Studies in Thermal Engineering, 42, no. February (2023):102706,
https://doi.org/10.1016/j.csite.2023.102706 . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Ćućuz, Stojan
AU  - Milivojević, Sanja
AU  - Ilić, Milica
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7642
AB  - Оil lubricates the contact of the orbiting and stationary scroll in the refrigerant scroll compressor, while the sealing between the scrolls is achieved by the refrigerant vapour pressure in the sealed back pressure chamber. The back pressure should be adjusted by the refrigerant-oil two-phase flow from the oil separator at the compressor discharge to the back pressure chamber and the refrigerant-oil flow from the back pressure chamber to the compressor suction side. Both flows are conducted through connecting tubes with corresponding high-pressure and low-pressure nozzles of small diameters. Models for the prediction of refrigerant-oil critical and subcritical flows through nozzles are developed and applied for the prediction of back pressure. The models are original since the slip between oil and refrigerant as well as the refrigerant solubility in oil are taken into account. The critical flow model is validated against experimental data available in the literature. The back pressure is predicted by equating the mass flow rates of refrigerant and oil two-phase mixtures through the high and low-pressure nozzles. The results show that the critical flow takes place through the high-pressure nozzle, while the subcritical flow through the low-pressure nozzle can also exist in cases with small pressure difference between the back pressure chamber and the compressor suction side. The refrigerant solubility in oil has a small influence on the critical and subcritical refrigerant-oil mixture mass flow rates, while the influence on the back pressure is more pronounced.
PB  - MDPI, Basel, Switzerland
T2  - Processes
T1  - Numerical Prediction of Refrigerant-Oil Two-Phase Flow from The Scroll Compressor Discharge to the Suction Side via the Back Pressure Chamber
IS  - 1
SP  - 6
VL  - 12
DO  - 10.3390/pr12010006
ER  - 

@article{
author = "Stevanović, Vladimir and Petrović, Milan M. and Ćućuz, Stojan and Milivojević, Sanja and Ilić, Milica",
year = "2023",
abstract = "Оil lubricates the contact of the orbiting and stationary scroll in the refrigerant scroll compressor, while the sealing between the scrolls is achieved by the refrigerant vapour pressure in the sealed back pressure chamber. The back pressure should be adjusted by the refrigerant-oil two-phase flow from the oil separator at the compressor discharge to the back pressure chamber and the refrigerant-oil flow from the back pressure chamber to the compressor suction side. Both flows are conducted through connecting tubes with corresponding high-pressure and low-pressure nozzles of small diameters. Models for the prediction of refrigerant-oil critical and subcritical flows through nozzles are developed and applied for the prediction of back pressure. The models are original since the slip between oil and refrigerant as well as the refrigerant solubility in oil are taken into account. The critical flow model is validated against experimental data available in the literature. The back pressure is predicted by equating the mass flow rates of refrigerant and oil two-phase mixtures through the high and low-pressure nozzles. The results show that the critical flow takes place through the high-pressure nozzle, while the subcritical flow through the low-pressure nozzle can also exist in cases with small pressure difference between the back pressure chamber and the compressor suction side. The refrigerant solubility in oil has a small influence on the critical and subcritical refrigerant-oil mixture mass flow rates, while the influence on the back pressure is more pronounced.",
publisher = "MDPI, Basel, Switzerland",
journal = "Processes",
title = "Numerical Prediction of Refrigerant-Oil Two-Phase Flow from The Scroll Compressor Discharge to the Suction Side via the Back Pressure Chamber",
number = "1",
pages = "6",
volume = "12",
doi = "10.3390/pr12010006"
}

Stevanović, V., Petrović, M. M., Ćućuz, S., Milivojević, S.,& Ilić, M.. (2023). Numerical Prediction of Refrigerant-Oil Two-Phase Flow from The Scroll Compressor Discharge to the Suction Side via the Back Pressure Chamber. in Processes
MDPI, Basel, Switzerland., 12(1), 6.
https://doi.org/10.3390/pr12010006

Stevanović V, Petrović MM, Ćućuz S, Milivojević S, Ilić M. Numerical Prediction of Refrigerant-Oil Two-Phase Flow from The Scroll Compressor Discharge to the Suction Side via the Back Pressure Chamber. in Processes. 2023;12(1):6.
doi:10.3390/pr12010006 .

Stevanović, Vladimir, Petrović, Milan M., Ćućuz, Stojan, Milivojević, Sanja, Ilić, Milica, "Numerical Prediction of Refrigerant-Oil Two-Phase Flow from The Scroll Compressor Discharge to the Suction Side via the Back Pressure Chamber" in Processes, 12, no. 1 (2023):6,
https://doi.org/10.3390/pr12010006 . .

TY  - JOUR
AU  - Ilić, Milica
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3953
AB  - This paper deals with investigations of mechanisms governing explosive boiling of water films on hot copper substrate with plain surface. The investigations are based on results of molecular dynamics (MD) simulations in which film thickness (7.5 nm, 17 nm and 25.5 nm) and substrate temperature (800 K, 700 K and 600 K) are set as parameters. Analyses of heating transients, which lead to explosive boiling event, are done comparing the following quantities for considered MD configurations: time instant of explosive boiling onset, dynamics of vapour generation, increase of water film thickness due to thermal expansion and vapour generation, evolution of water temperature as well as heat transfer from the copper substrate to the water film. These analyses have shown that explosive boiling onset is related neither to the value of substrate temperature nor to the film thickness in a straightforward way. The investigations of temperature and per atom energy in the water region near the heating substrate surface have revealed that beside thermal also mechanical mechanisms can play significant role in triggering of explosive boiling. The mechanical mechanisms, related to pressure wave propagation in liquid film, comprise occurrence of tensile stresses which induce / intensify generation of vapour phase in the near wall region. The obtained results show that thermal effects are dominant in cases with high substrate temperature and thick liquid films as in these configurations the water temperature reaches spinodal value and explosive boiling is triggered before expansion wave reaches the near wall region. In cases when water in the near wall region is strongly overheated (but well below spinodal temperature), tensile stresses induced by expansive wave propagation cause intensive vapour generation and contribute dominantly to occurrence of explosive boiling. Finally, in cases with lower substrate temperature and thin liquid films, an interplay of thermal and mechanical mechanisms leads to explosive boiling. Beside these, the disjoining pressure seems to play a role in cases with thin liquid films.
PB  - Elsevier
T2  - Applied Thermal Engineering
T1  - Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature
IS  - February
SP  - 119749
VL  - 220
DO  - 10.1016/j.applthermaleng.2022.119749
ER  - 

@article{
author = "Ilić, Milica and Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M.",
year = "2023",
abstract = "This paper deals with investigations of mechanisms governing explosive boiling of water films on hot copper substrate with plain surface. The investigations are based on results of molecular dynamics (MD) simulations in which film thickness (7.5 nm, 17 nm and 25.5 nm) and substrate temperature (800 K, 700 K and 600 K) are set as parameters. Analyses of heating transients, which lead to explosive boiling event, are done comparing the following quantities for considered MD configurations: time instant of explosive boiling onset, dynamics of vapour generation, increase of water film thickness due to thermal expansion and vapour generation, evolution of water temperature as well as heat transfer from the copper substrate to the water film. These analyses have shown that explosive boiling onset is related neither to the value of substrate temperature nor to the film thickness in a straightforward way. The investigations of temperature and per atom energy in the water region near the heating substrate surface have revealed that beside thermal also mechanical mechanisms can play significant role in triggering of explosive boiling. The mechanical mechanisms, related to pressure wave propagation in liquid film, comprise occurrence of tensile stresses which induce / intensify generation of vapour phase in the near wall region. The obtained results show that thermal effects are dominant in cases with high substrate temperature and thick liquid films as in these configurations the water temperature reaches spinodal value and explosive boiling is triggered before expansion wave reaches the near wall region. In cases when water in the near wall region is strongly overheated (but well below spinodal temperature), tensile stresses induced by expansive wave propagation cause intensive vapour generation and contribute dominantly to occurrence of explosive boiling. Finally, in cases with lower substrate temperature and thin liquid films, an interplay of thermal and mechanical mechanisms leads to explosive boiling. Beside these, the disjoining pressure seems to play a role in cases with thin liquid films.",
publisher = "Elsevier",
journal = "Applied Thermal Engineering",
title = "Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature",
number = "February",
pages = "119749",
volume = "220",
doi = "10.1016/j.applthermaleng.2022.119749"
}

Ilić, M., Stevanović, V., Milivojević, S.,& Petrović, M. M.. (2023). Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature. in Applied Thermal Engineering
Elsevier., 220(February), 119749.
https://doi.org/10.1016/j.applthermaleng.2022.119749

Ilić M, Stevanović V, Milivojević S, Petrović MM. Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature. in Applied Thermal Engineering. 2023;220(February):119749.
doi:10.1016/j.applthermaleng.2022.119749 .

Ilić, Milica, Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., "Explosive boiling of water films based on molecular dynamics simulations: Effects of film thickness and substrate temperature" in Applied Thermal Engineering, 220, no. February (2023):119749,
https://doi.org/10.1016/j.applthermaleng.2022.119749 . .

TY  - CONF
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
AU  - Ilić, Milica
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4511
AB  - The analysis of pressure changes in water and steam flow along the entire once-through steam 
boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period 
of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic
resistance was recorded in comparison to the design values in the evaporator tubes, both in 
the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of 
this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner 
wall of tubes. The significantly increased hydraulic roughness on the inner wall of tubes was determined
on the basis of measured pressure drops at sections of the tube system and numerical calculation
performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube 
flows. The model is based on the steam-water two-fluid model with mass, momentum and energy 
balance equations and mechanistic correlations for the steam-water interface transfer processes. The 
model is suitable for the single and two-phase flow parameters prediction in the span from subcritical 
to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight
in the fluid pressure, velocity and temperature change in the boiler tube system. After the long 
operational period the pressure drop in evaporating tubes almost doubles in comparison to the design 
values. The presented results are a support to boiler’s design, operational procedures and maintenance.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS)
C3  - 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022.
T1  - Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4511
ER  - 

@conference{
author = "Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M. and Ilić, Milica",
year = "2022",
abstract = "The analysis of pressure changes in water and steam flow along the entire once-through steam 
boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period 
of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic
resistance was recorded in comparison to the design values in the evaporator tubes, both in 
the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of 
this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner 
wall of tubes. The significantly increased hydraulic roughness on the inner wall of tubes was determined
on the basis of measured pressure drops at sections of the tube system and numerical calculation
performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube 
flows. The model is based on the steam-water two-fluid model with mass, momentum and energy 
balance equations and mechanistic correlations for the steam-water interface transfer processes. The 
model is suitable for the single and two-phase flow parameters prediction in the span from subcritical 
to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight
in the fluid pressure, velocity and temperature change in the boiler tube system. After the long 
operational period the pressure drop in evaporating tubes almost doubles in comparison to the design 
values. The presented results are a support to boiler’s design, operational procedures and maintenance.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS)",
journal = "35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022.",
title = "Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4511"
}

Stevanović, V., Milivojević, S., Petrović, M. M.,& Ilić, M.. (2022). Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit. in 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022.
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS)..
https://hdl.handle.net/21.15107/rcub_machinery_4511

Stevanović V, Milivojević S, Petrović MM, Ilić M. Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit. in 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022.. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_4511 .

Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., Ilić, Milica, "Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit" in 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022. (2022),
https://hdl.handle.net/21.15107/rcub_machinery_4511 .

TY  - JOUR
AU  - Milivojević, Sanja
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Ilić, Milica
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4504
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)
T2  - Procesna tehnika
T1  - Povećanje energetske efikasnosti parnog bloka  iskorišćenjem otpadne toplote dimnog gasa
EP  - 37
IS  - 2
SP  - 30
VL  - Godina 33
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4504
ER  - 

@article{
author = "Milivojević, Sanja and Stevanović, Vladimir and Petrović, Milan M. and Ilić, Milica",
year = "2022",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)",
journal = "Procesna tehnika",
title = "Povećanje energetske efikasnosti parnog bloka  iskorišćenjem otpadne toplote dimnog gasa",
pages = "37-30",
number = "2",
volume = "Godina 33",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4504"
}

Milivojević, S., Stevanović, V., Petrović, M. M.,& Ilić, M.. (2022). Povećanje energetske efikasnosti parnog bloka  iskorišćenjem otpadne toplote dimnog gasa. in Procesna tehnika
Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)., Godina 33(2), 30-37.
https://hdl.handle.net/21.15107/rcub_machinery_4504

Milivojević S, Stevanović V, Petrović MM, Ilić M. Povećanje energetske efikasnosti parnog bloka  iskorišćenjem otpadne toplote dimnog gasa. in Procesna tehnika. 2022;Godina 33(2):30-37.
https://hdl.handle.net/21.15107/rcub_machinery_4504 .

Milivojević, Sanja, Stevanović, Vladimir, Petrović, Milan M., Ilić, Milica, "Povećanje energetske efikasnosti parnog bloka  iskorišćenjem otpadne toplote dimnog gasa" in Procesna tehnika, Godina 33, no. 2 (2022):30-37,
https://hdl.handle.net/21.15107/rcub_machinery_4504 .

TY  - CONF
AU  - Petrović, Milan M.
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Ilić, Milica
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4497
AB  - A concise one-dimensional thermal-hydraulic two-fluid model is presented for the 
numerical prediction of sulphur dioxide absorption from the flue gas onto drops of the waterlimestone
slurry in the vertical spray tower absorber. The model is based on mass, momentum and 
energy balance equations for each phase separately, i.e. downward falling droplets of water-limestone 
slurry and upward flowing flue gas. The sulphur dioxide content in the flue gas is predicted by a 
balance equation of the sulphur dioxide mass fraction in the flue gas. Interface transfer processes 
between the flue gas and the droplets are determined by closure laws. The obtained steady-state 
balance equations are transformed in a form suitable for a direct application of the numerical 
integration method for the system of ordinary differential equations. The developed thermal-hydraulic 
model is validated by comparing numerical results with available measured data at the large utility 
absorber. The presented results clearly show the dynamics of flue gas and droplets thermal-hydraulic 
processes and their influence on the absorption process. The influence of liquid-to-gas ratio and 
droplet diameter on sulphur dioxide removal efficiency has been investigated.
PB  - Društvo termičara Srbije
C3  - Industrijska energetika i zaštita životne sredine u zemljama Jugoistočne Evrope, IEEP 2022, November 8-10, 2022
T1  - NUMERICAL SIMULATION OF WET FLUE GAS DESULPHURIZATION  IN WET SPRAY ABSORBER
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4497
ER  - 

@conference{
author = "Petrović, Milan M. and Stevanović, Vladimir and Milivojević, Sanja and Ilić, Milica",
year = "2022",
abstract = "A concise one-dimensional thermal-hydraulic two-fluid model is presented for the 
numerical prediction of sulphur dioxide absorption from the flue gas onto drops of the waterlimestone
slurry in the vertical spray tower absorber. The model is based on mass, momentum and 
energy balance equations for each phase separately, i.e. downward falling droplets of water-limestone 
slurry and upward flowing flue gas. The sulphur dioxide content in the flue gas is predicted by a 
balance equation of the sulphur dioxide mass fraction in the flue gas. Interface transfer processes 
between the flue gas and the droplets are determined by closure laws. The obtained steady-state 
balance equations are transformed in a form suitable for a direct application of the numerical 
integration method for the system of ordinary differential equations. The developed thermal-hydraulic 
model is validated by comparing numerical results with available measured data at the large utility 
absorber. The presented results clearly show the dynamics of flue gas and droplets thermal-hydraulic 
processes and their influence on the absorption process. The influence of liquid-to-gas ratio and 
droplet diameter on sulphur dioxide removal efficiency has been investigated.",
publisher = "Društvo termičara Srbije",
journal = "Industrijska energetika i zaštita životne sredine u zemljama Jugoistočne Evrope, IEEP 2022, November 8-10, 2022",
title = "NUMERICAL SIMULATION OF WET FLUE GAS DESULPHURIZATION  IN WET SPRAY ABSORBER",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4497"
}

Petrović, M. M., Stevanović, V., Milivojević, S.,& Ilić, M.. (2022). NUMERICAL SIMULATION OF WET FLUE GAS DESULPHURIZATION  IN WET SPRAY ABSORBER. in Industrijska energetika i zaštita životne sredine u zemljama Jugoistočne Evrope, IEEP 2022, November 8-10, 2022
Društvo termičara Srbije..
https://hdl.handle.net/21.15107/rcub_machinery_4497

Petrović MM, Stevanović V, Milivojević S, Ilić M. NUMERICAL SIMULATION OF WET FLUE GAS DESULPHURIZATION  IN WET SPRAY ABSORBER. in Industrijska energetika i zaštita životne sredine u zemljama Jugoistočne Evrope, IEEP 2022, November 8-10, 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_4497 .

Petrović, Milan M., Stevanović, Vladimir, Milivojević, Sanja, Ilić, Milica, "NUMERICAL SIMULATION OF WET FLUE GAS DESULPHURIZATION  IN WET SPRAY ABSORBER" in Industrijska energetika i zaštita životne sredine u zemljama Jugoistočne Evrope, IEEP 2022, November 8-10, 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_4497 .

TY  - CONF
AU  - Milivojević, Sanja
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Ilić, Milica
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4520
AB  - U termoelektranama sa starijim projektnim rešenjima postoji značajan potencijal za iskorišćenje otpadne toplote 
dimnih gasova. Otpadna toplota dimnog gasa se može iskoristiti primenom zagrejača vode visokog pritiska (ZVVP) i 
niskog pritiska (ZVNP). U ovom radu je razmatrano rešenje sa ZVVP koji se napaja vоdоm sа pоtisnоg vоdа nаpојnе 
pumpе parnog bloka termoelektrane na ugalj, kao i primena ZVNP koji se napaja kondenzatom iz linije kondenzata 
niskog pritiska. U cilju poređenja energetskih efekata primene ZVVP i ZVNP, usvojene su iste površine oba 
razmenjivača. Minimalna temperatura kondenzata na ulazu u zagrejač vode je ograničena pojavom niskotemperaturne 
korozije. Povećanje električne snage na generatoru bruto ugradnjom ZVVP je 2,5 puta veće nego u slučaju sa ZVNP, a 
povećanje stepena korisnosti bloka bruto ugradnjom ZVNP je za 20% veće nego sa ZVVP. U radu su predstavljeni 
efekti ugradnje ZVVP koji se napaja hladnom napojnom vodom u termoelektrani "Nikola Tesla B".
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)
C3  - 34. Međunarodni kongres o procesnoj industriji - Procesing 2021, Novi Sad, Srbija, 3-4. jun 2021
T1  - Povećanje energetske efikasnosti parnog bloka iskorišćenjem otpadne toplote dimnog gasa
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4520
ER  - 

@conference{
author = "Milivojević, Sanja and Stevanović, Vladimir and Petrović, Milan M. and Ilić, Milica",
year = "2021",
abstract = "U termoelektranama sa starijim projektnim rešenjima postoji značajan potencijal za iskorišćenje otpadne toplote 
dimnih gasova. Otpadna toplota dimnog gasa se može iskoristiti primenom zagrejača vode visokog pritiska (ZVVP) i 
niskog pritiska (ZVNP). U ovom radu je razmatrano rešenje sa ZVVP koji se napaja vоdоm sа pоtisnоg vоdа nаpојnе 
pumpе parnog bloka termoelektrane na ugalj, kao i primena ZVNP koji se napaja kondenzatom iz linije kondenzata 
niskog pritiska. U cilju poređenja energetskih efekata primene ZVVP i ZVNP, usvojene su iste površine oba 
razmenjivača. Minimalna temperatura kondenzata na ulazu u zagrejač vode je ograničena pojavom niskotemperaturne 
korozije. Povećanje električne snage na generatoru bruto ugradnjom ZVVP je 2,5 puta veće nego u slučaju sa ZVNP, a 
povećanje stepena korisnosti bloka bruto ugradnjom ZVNP je za 20% veće nego sa ZVVP. U radu su predstavljeni 
efekti ugradnje ZVVP koji se napaja hladnom napojnom vodom u termoelektrani "Nikola Tesla B".",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)",
journal = "34. Međunarodni kongres o procesnoj industriji - Procesing 2021, Novi Sad, Srbija, 3-4. jun 2021",
title = "Povećanje energetske efikasnosti parnog bloka iskorišćenjem otpadne toplote dimnog gasa",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4520"
}

Milivojević, S., Stevanović, V., Petrović, M. M.,& Ilić, M.. (2021). Povećanje energetske efikasnosti parnog bloka iskorišćenjem otpadne toplote dimnog gasa. in 34. Međunarodni kongres o procesnoj industriji - Procesing 2021, Novi Sad, Srbija, 3-4. jun 2021
Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)..
https://hdl.handle.net/21.15107/rcub_machinery_4520

Milivojević S, Stevanović V, Petrović MM, Ilić M. Povećanje energetske efikasnosti parnog bloka iskorišćenjem otpadne toplote dimnog gasa. in 34. Međunarodni kongres o procesnoj industriji - Procesing 2021, Novi Sad, Srbija, 3-4. jun 2021. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_4520 .

Milivojević, Sanja, Stevanović, Vladimir, Petrović, Milan M., Ilić, Milica, "Povećanje energetske efikasnosti parnog bloka iskorišćenjem otpadne toplote dimnog gasa" in 34. Međunarodni kongres o procesnoj industriji - Procesing 2021, Novi Sad, Srbija, 3-4. jun 2021 (2021),
https://hdl.handle.net/21.15107/rcub_machinery_4520 .

TY  - JOUR
AU  - Ilić, Milica
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3609
AB  - In this paper the dynamics of explosive boiling of a 72 angstrom thick water film on the hot copper substrate with the plain surface is analysed. The analyses are based on the results of molecular dynamics (MD) simulations of the transient in which the thermostat temperature within the solid substrate is increased from 298 to 800K. The obtained results show that explosive boiling comprises several phases. The first phase involves rapid thermoacoustic pressure build-up in the near wall region due to intensive water heating and its volumetric expansion. The generated compression wave propagates through the liquid film reaching the peak value higher than critical water pressure. Due to reflection at the free film surface the original compression wave turns into an expansion wave. This event leads to a rapid pressure decrease and occurrence of tension stress. The second phase starts when the pressure enters the negative domain. This phase is accompanied with nucleation of vapour embryos and their subsequent growth in the superheated water layer in the near wall region. As the intensity of vapour phase generation is moderate, the liquid film in this phase is still exposed to tension. The stress recovery starts in the third phase when the water temperature in the near wall layer attains the spinodal value. This leads to a massive vaporization, nanobubble coalescence and thermal explosion, which causes spallation of the liquid film and lift-off of the liquid slug. The last phase is characterized by suppression of heat transfer by the expanding vapour layer. As a consequence, after reaching the maximum, the pressure decreases. This paper gives quantitative description and detailed insight into the mechanisms associated with each of the aforementioned phases.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Heat and Mass Transfer
T1  - New insights into physics of explosive water boiling derived from molecular dynamics simulations
SP  - 121141
VL  - 172
DO  - 10.1016/j.ijheatmasstransfer.2021.121141
ER  - 

@article{
author = "Ilić, Milica and Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M.",
year = "2021",
abstract = "In this paper the dynamics of explosive boiling of a 72 angstrom thick water film on the hot copper substrate with the plain surface is analysed. The analyses are based on the results of molecular dynamics (MD) simulations of the transient in which the thermostat temperature within the solid substrate is increased from 298 to 800K. The obtained results show that explosive boiling comprises several phases. The first phase involves rapid thermoacoustic pressure build-up in the near wall region due to intensive water heating and its volumetric expansion. The generated compression wave propagates through the liquid film reaching the peak value higher than critical water pressure. Due to reflection at the free film surface the original compression wave turns into an expansion wave. This event leads to a rapid pressure decrease and occurrence of tension stress. The second phase starts when the pressure enters the negative domain. This phase is accompanied with nucleation of vapour embryos and their subsequent growth in the superheated water layer in the near wall region. As the intensity of vapour phase generation is moderate, the liquid film in this phase is still exposed to tension. The stress recovery starts in the third phase when the water temperature in the near wall layer attains the spinodal value. This leads to a massive vaporization, nanobubble coalescence and thermal explosion, which causes spallation of the liquid film and lift-off of the liquid slug. The last phase is characterized by suppression of heat transfer by the expanding vapour layer. As a consequence, after reaching the maximum, the pressure decreases. This paper gives quantitative description and detailed insight into the mechanisms associated with each of the aforementioned phases.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Heat and Mass Transfer",
title = "New insights into physics of explosive water boiling derived from molecular dynamics simulations",
pages = "121141",
volume = "172",
doi = "10.1016/j.ijheatmasstransfer.2021.121141"
}

Ilić, M., Stevanović, V., Milivojević, S.,& Petrović, M. M.. (2021). New insights into physics of explosive water boiling derived from molecular dynamics simulations. in International Journal of Heat and Mass Transfer
Pergamon-Elsevier Science Ltd, Oxford., 172, 121141.
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121141

Ilić M, Stevanović V, Milivojević S, Petrović MM. New insights into physics of explosive water boiling derived from molecular dynamics simulations. in International Journal of Heat and Mass Transfer. 2021;172:121141.
doi:10.1016/j.ijheatmasstransfer.2021.121141 .

Ilić, Milica, Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., "New insights into physics of explosive water boiling derived from molecular dynamics simulations" in International Journal of Heat and Mass Transfer, 172 (2021):121141,
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121141 . .

TY  - JOUR
AU  - Petrović, Milan M.
AU  - Stevanović, Vladimir
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3544
AB  - A new CFD modeling approach is developed and applied to a numerical study of pool boiling. It is based on a coupled simultaneous solving of the two-fluid model of two-phase flow in the boiling pool and the transient heat conduction within the heated wall. The applied two-fluid model consist in mass, momentum and energy balance equations for each phase and the closure laws for interface transport due to friction and phase transition. The boiling two-fluid mixture is thermally coupled with the heated wall by the heat transfer at the bubble footprint at randomly determined discrete locations of the nucleation sites and by the conjugate heat transfer from the heated wall to the wetting liquid on the surface outside the nucleation sites. The model is validated against detailed experimental data from the literature. Sensitivity analysis is performed to evaluate the influence of pool boiling parameters and conditions on the boiling curve, such as the nucleation site density, the wetting contact angle, the wall thermal conductivity, the wall thickness, the wall volumetric or bottom surface heating and the liquid volume in the pool. Temperature transients at the bubble nucleation sites are evaluated. The two-phase mixture pattern in pool boiling and the related swell level position can be well predicted with the nonuniform heat flux determined by the discrete nucleation sites of bubble growth and conjugate heat transfer from the heated wall to wetting liquid. The developed computational method is efficient and robust, while the reliability of its prediction is sensitive to the accuracy of nucleation site density and contact angle input data, as parameters that describe the coupled thermal and physical characteristics at the fluid-wall interface.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Numerical Heat Transfer Part A-Applications
T1  - Coupled two-fluid flow and wall heat conduction modeling of nucleate pool boiling
EP  - 91
IS  - 3
SP  - 63
VL  - 80
DO  - 10.1080/10407782.2021.1935047
ER  - 

@article{
author = "Petrović, Milan M. and Stevanović, Vladimir",
year = "2021",
abstract = "A new CFD modeling approach is developed and applied to a numerical study of pool boiling. It is based on a coupled simultaneous solving of the two-fluid model of two-phase flow in the boiling pool and the transient heat conduction within the heated wall. The applied two-fluid model consist in mass, momentum and energy balance equations for each phase and the closure laws for interface transport due to friction and phase transition. The boiling two-fluid mixture is thermally coupled with the heated wall by the heat transfer at the bubble footprint at randomly determined discrete locations of the nucleation sites and by the conjugate heat transfer from the heated wall to the wetting liquid on the surface outside the nucleation sites. The model is validated against detailed experimental data from the literature. Sensitivity analysis is performed to evaluate the influence of pool boiling parameters and conditions on the boiling curve, such as the nucleation site density, the wetting contact angle, the wall thermal conductivity, the wall thickness, the wall volumetric or bottom surface heating and the liquid volume in the pool. Temperature transients at the bubble nucleation sites are evaluated. The two-phase mixture pattern in pool boiling and the related swell level position can be well predicted with the nonuniform heat flux determined by the discrete nucleation sites of bubble growth and conjugate heat transfer from the heated wall to wetting liquid. The developed computational method is efficient and robust, while the reliability of its prediction is sensitive to the accuracy of nucleation site density and contact angle input data, as parameters that describe the coupled thermal and physical characteristics at the fluid-wall interface.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Numerical Heat Transfer Part A-Applications",
title = "Coupled two-fluid flow and wall heat conduction modeling of nucleate pool boiling",
pages = "91-63",
number = "3",
volume = "80",
doi = "10.1080/10407782.2021.1935047"
}

Petrović, M. M.,& Stevanović, V.. (2021). Coupled two-fluid flow and wall heat conduction modeling of nucleate pool boiling. in Numerical Heat Transfer Part A-Applications
Taylor & Francis Inc, Philadelphia., 80(3), 63-91.
https://doi.org/10.1080/10407782.2021.1935047

Petrović MM, Stevanović V. Coupled two-fluid flow and wall heat conduction modeling of nucleate pool boiling. in Numerical Heat Transfer Part A-Applications. 2021;80(3):63-91.
doi:10.1080/10407782.2021.1935047 .

Petrović, Milan M., Stevanović, Vladimir, "Coupled two-fluid flow and wall heat conduction modeling of nucleate pool boiling" in Numerical Heat Transfer Part A-Applications, 80, no. 3 (2021):63-91,
https://doi.org/10.1080/10407782.2021.1935047 . .

TY  - JOUR
AU  - Petrović, Milan M.
AU  - Stevanović, Vladimir
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3484
AB  - The standard computational fluid dynamics (CFD) approach to nucleate boiling simulation is based on the Eulerian modelling and the subgrid wall boiling model (SWBM). The liquid and vapour phase are treated as interpenetrating media and considered mechanisms of heat transfer on the heated wall are not spatially resolved. Such an approach does not distinguish locations of bubble growth from the remaining surface of convective heat transfer. The present paper introduces the grid resolved wall boiling model (GRWBM) in the Eulerian simulation of nucleate boiling. This approach distinguishes locations of bubble growth from the remaining surface of conjugate heat transfer from the heated wall to liquid. The new approach is validated against detailed experimental data on nucleate pool boiling from the literature. GRWBM and SWBM simulation results are compared to each other. The simulation with the GRWBM predicts fairly well the wall temperature transient at the footprint of bubble growth, the mean wall superheating, the void change along the pool height and the two-phase mixture swell level. The SWBM does not predict adequately dynamics of the wall temperature transient and the void fraction distribution in the boiling pool, especially under high heat fluxes.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Multiphase Flow
T1  - Pool boiling simulation with two-fluid and grid resolved wall boiling model
SP  - 103806
VL  - 144
DO  - 10.1016/j.ijmultiphaseflow.2021.103806
ER  - 

@article{
author = "Petrović, Milan M. and Stevanović, Vladimir",
year = "2021",
abstract = "The standard computational fluid dynamics (CFD) approach to nucleate boiling simulation is based on the Eulerian modelling and the subgrid wall boiling model (SWBM). The liquid and vapour phase are treated as interpenetrating media and considered mechanisms of heat transfer on the heated wall are not spatially resolved. Such an approach does not distinguish locations of bubble growth from the remaining surface of convective heat transfer. The present paper introduces the grid resolved wall boiling model (GRWBM) in the Eulerian simulation of nucleate boiling. This approach distinguishes locations of bubble growth from the remaining surface of conjugate heat transfer from the heated wall to liquid. The new approach is validated against detailed experimental data on nucleate pool boiling from the literature. GRWBM and SWBM simulation results are compared to each other. The simulation with the GRWBM predicts fairly well the wall temperature transient at the footprint of bubble growth, the mean wall superheating, the void change along the pool height and the two-phase mixture swell level. The SWBM does not predict adequately dynamics of the wall temperature transient and the void fraction distribution in the boiling pool, especially under high heat fluxes.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Multiphase Flow",
title = "Pool boiling simulation with two-fluid and grid resolved wall boiling model",
pages = "103806",
volume = "144",
doi = "10.1016/j.ijmultiphaseflow.2021.103806"
}

Petrović, M. M.,& Stevanović, V.. (2021). Pool boiling simulation with two-fluid and grid resolved wall boiling model. in International Journal of Multiphase Flow
Pergamon-Elsevier Science Ltd, Oxford., 144, 103806.
https://doi.org/10.1016/j.ijmultiphaseflow.2021.103806

Petrović MM, Stevanović V. Pool boiling simulation with two-fluid and grid resolved wall boiling model. in International Journal of Multiphase Flow. 2021;144:103806.
doi:10.1016/j.ijmultiphaseflow.2021.103806 .

Petrović, Milan M., Stevanović, Vladimir, "Pool boiling simulation with two-fluid and grid resolved wall boiling model" in International Journal of Multiphase Flow, 144 (2021):103806,
https://doi.org/10.1016/j.ijmultiphaseflow.2021.103806 . .

TY  - CONF
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
AU  - Ilić, Milica
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4493
AB  - The analysis of pressure changes in water and steam flow along the entire once-through steam boiler 
tube system was carried out. An efficient advanced method is developed and presented for the 
prediction of once-through boiler thermalhydraulics, which is based on the steam-water two-fluid 
model with mass, momentum and energy balance equations and mechanistic correlations for the 
steam-water interface transfer processes. The model is suitable for the fluid flow parameters prediction 
in the span from single and two-phase flow conditions under subcritical operating conditions to 
supercritical and near critical flow conditions. Conducted calculations provide detailed insight in the 
fluid pressure, velocity and temperature change in the boiler tube system. The numerical results are 
validated by comparison with data measured at the boiler tube system. The thermalhydraulic analysis 
shows that a significant increase in hydraulic resistance occurs in boiler evaporator tubes, while this 
increase in the steam superheater tubes is lower. The increase of hydraulic resistance in the evaporator 
tubes, both in the water heating zone and in the evaporation zone with the two phase mixture flow is 
due to the fouling deposited on the inner wall of tubes. The pressure drop in evaporating tubes almost 
doubles in comparison to the design values after the long operational period. The presented results are 
a support to boiler’s design, operational procedures and maintenance.
PB  - Department of Thermal Technology, Gliwice, Poland, Silesian University of Technology 2020
C3  - Proceedings of the 6th International Conference on Contemporary Problems of Thermal Engineering - CPOTE 2020, online, Poland, September 21-24, 2020
T1  - Thermalhydraulics of once-through steam boiler tubes revisited
EP  - 328
SP  - 317
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4493
ER  - 

@conference{
author = "Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M. and Ilić, Milica",
year = "2020",
abstract = "The analysis of pressure changes in water and steam flow along the entire once-through steam boiler 
tube system was carried out. An efficient advanced method is developed and presented for the 
prediction of once-through boiler thermalhydraulics, which is based on the steam-water two-fluid 
model with mass, momentum and energy balance equations and mechanistic correlations for the 
steam-water interface transfer processes. The model is suitable for the fluid flow parameters prediction 
in the span from single and two-phase flow conditions under subcritical operating conditions to 
supercritical and near critical flow conditions. Conducted calculations provide detailed insight in the 
fluid pressure, velocity and temperature change in the boiler tube system. The numerical results are 
validated by comparison with data measured at the boiler tube system. The thermalhydraulic analysis 
shows that a significant increase in hydraulic resistance occurs in boiler evaporator tubes, while this 
increase in the steam superheater tubes is lower. The increase of hydraulic resistance in the evaporator 
tubes, both in the water heating zone and in the evaporation zone with the two phase mixture flow is 
due to the fouling deposited on the inner wall of tubes. The pressure drop in evaporating tubes almost 
doubles in comparison to the design values after the long operational period. The presented results are 
a support to boiler’s design, operational procedures and maintenance.",
publisher = "Department of Thermal Technology, Gliwice, Poland, Silesian University of Technology 2020",
journal = "Proceedings of the 6th International Conference on Contemporary Problems of Thermal Engineering - CPOTE 2020, online, Poland, September 21-24, 2020",
title = "Thermalhydraulics of once-through steam boiler tubes revisited",
pages = "328-317",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4493"
}

Stevanović, V., Milivojević, S., Petrović, M. M.,& Ilić, M.. (2020). Thermalhydraulics of once-through steam boiler tubes revisited. in Proceedings of the 6th International Conference on Contemporary Problems of Thermal Engineering - CPOTE 2020, online, Poland, September 21-24, 2020
Department of Thermal Technology, Gliwice, Poland, Silesian University of Technology 2020., 317-328.
https://hdl.handle.net/21.15107/rcub_machinery_4493

Stevanović V, Milivojević S, Petrović MM, Ilić M. Thermalhydraulics of once-through steam boiler tubes revisited. in Proceedings of the 6th International Conference on Contemporary Problems of Thermal Engineering - CPOTE 2020, online, Poland, September 21-24, 2020. 2020;:317-328.
https://hdl.handle.net/21.15107/rcub_machinery_4493 .

Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., Ilić, Milica, "Thermalhydraulics of once-through steam boiler tubes revisited" in Proceedings of the 6th International Conference on Contemporary Problems of Thermal Engineering - CPOTE 2020, online, Poland, September 21-24, 2020 (2020):317-328,
https://hdl.handle.net/21.15107/rcub_machinery_4493 .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Milivojević, Sanja
AU  - Ilić, Milica
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3342
AB  - Thermal power plants are forced to operate under frequent load changes in energy systems with increased share of solar and wind power plants. These load changes increase thermal power plant aging and reduce their efficiency. Therefore, solutions for energy storage are sought in order to accumulate energy in periods of lower power demand and produce excess power in periods of increased demands. In the present paper the steam accumulator as the thermal energy storage device is applied in a 650 MWe coal-fired thermal power plant to increase its flexibility under the demand for the variable load changes. The steam accumulator is charged during periods of lower power demand, as during the night hours, and discharged during peak load demands. The steam accumulator with volume of 600 m(3) is charged with superheated steam (pressure 4.5 MPa and temperature 335 degrees C) extracted from the exit of high pressure steam turbine. The steam discharged from the steam accumulator replaces the turbine steam extraction for two low pressure heaters: a 59.5 MWt and a 54.6 MWt heater operating at 0.56 MPa and 0.23 MPa steam pressure. This replacement results in an increase of the steam flow rate through the turbine and the turbine power gain of 27.3 MWe during 27 min and 11.5 MWe for additional 13 min. The proposed solution of the steam accumulator installation in the power plant is a new design. The upgrade of power plant flexibility by steam accumulator is demonstrated.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy Conversion and Management
T1  - Upgrade of the thermal power plant flexibility by the steam accumulator
SP  - 113271
VL  - 223
DO  - 10.1016/j.enconman.2020.113271
ER  - 

@article{
author = "Stevanović, Vladimir and Petrović, Milan M. and Milivojević, Sanja and Ilić, Milica",
year = "2020",
abstract = "Thermal power plants are forced to operate under frequent load changes in energy systems with increased share of solar and wind power plants. These load changes increase thermal power plant aging and reduce their efficiency. Therefore, solutions for energy storage are sought in order to accumulate energy in periods of lower power demand and produce excess power in periods of increased demands. In the present paper the steam accumulator as the thermal energy storage device is applied in a 650 MWe coal-fired thermal power plant to increase its flexibility under the demand for the variable load changes. The steam accumulator is charged during periods of lower power demand, as during the night hours, and discharged during peak load demands. The steam accumulator with volume of 600 m(3) is charged with superheated steam (pressure 4.5 MPa and temperature 335 degrees C) extracted from the exit of high pressure steam turbine. The steam discharged from the steam accumulator replaces the turbine steam extraction for two low pressure heaters: a 59.5 MWt and a 54.6 MWt heater operating at 0.56 MPa and 0.23 MPa steam pressure. This replacement results in an increase of the steam flow rate through the turbine and the turbine power gain of 27.3 MWe during 27 min and 11.5 MWe for additional 13 min. The proposed solution of the steam accumulator installation in the power plant is a new design. The upgrade of power plant flexibility by steam accumulator is demonstrated.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy Conversion and Management",
title = "Upgrade of the thermal power plant flexibility by the steam accumulator",
pages = "113271",
volume = "223",
doi = "10.1016/j.enconman.2020.113271"
}

Stevanović, V., Petrović, M. M., Milivojević, S.,& Ilić, M.. (2020). Upgrade of the thermal power plant flexibility by the steam accumulator. in Energy Conversion and Management
Pergamon-Elsevier Science Ltd, Oxford., 223, 113271.
https://doi.org/10.1016/j.enconman.2020.113271

Stevanović V, Petrović MM, Milivojević S, Ilić M. Upgrade of the thermal power plant flexibility by the steam accumulator. in Energy Conversion and Management. 2020;223:113271.
doi:10.1016/j.enconman.2020.113271 .

Stevanović, Vladimir, Petrović, Milan M., Milivojević, Sanja, Ilić, Milica, "Upgrade of the thermal power plant flexibility by the steam accumulator" in Energy Conversion and Management, 223 (2020):113271,
https://doi.org/10.1016/j.enconman.2020.113271 . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3294
AB  - A steam turbine trip is followed by a prompt closure of stop valves in front of the turbine and consequently to a pressure rise in the main steam pipeline. This steam hammer transient leads to the generation of intensive fluid dynamic forces that act along the pipeline axis and induce additional dynamic loads on the main steam pipeline. It is a common practice to assume a simultaneous closure of all stop valves in the safety analysis of the main steam pipeline. In the present paper computer simulations and analyses of the fluid dynamic forces are performed for several scenarios that take into account the possibility of delayed closure of the stop valve in front of the turbine. The influence of the failure of the steam by-pass line opening is considered too. The results show that the delay of the stop valve closure increases the maximum intensity of fluid dynamic force in the pipeline segment in front of the stop valve and decreases the intensity of fluid dynamic forces in segments along the pipeline. The failure of the by-pass line to open leads to prolonged steam pressure and fluid dynamic forces oscillation in pipeline segments. The simulations were performed with the in-house computer code based on the method of characteristics for the solving of the hyperbolic system of PDE that represent the mass, momentum and energy balance equations of the 1-D, compressible and transient fluid-flow. The obtained results are a support to safety analyses of thermal power plants under transient conditions.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure
EP  - 2224
IS  - 3
SP  - 2213
VL  - 24
DO  - 10.2298/TSCI190915426S
ER  - 

@article{
author = "Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M.",
year = "2020",
abstract = "A steam turbine trip is followed by a prompt closure of stop valves in front of the turbine and consequently to a pressure rise in the main steam pipeline. This steam hammer transient leads to the generation of intensive fluid dynamic forces that act along the pipeline axis and induce additional dynamic loads on the main steam pipeline. It is a common practice to assume a simultaneous closure of all stop valves in the safety analysis of the main steam pipeline. In the present paper computer simulations and analyses of the fluid dynamic forces are performed for several scenarios that take into account the possibility of delayed closure of the stop valve in front of the turbine. The influence of the failure of the steam by-pass line opening is considered too. The results show that the delay of the stop valve closure increases the maximum intensity of fluid dynamic force in the pipeline segment in front of the stop valve and decreases the intensity of fluid dynamic forces in segments along the pipeline. The failure of the by-pass line to open leads to prolonged steam pressure and fluid dynamic forces oscillation in pipeline segments. The simulations were performed with the in-house computer code based on the method of characteristics for the solving of the hyperbolic system of PDE that represent the mass, momentum and energy balance equations of the 1-D, compressible and transient fluid-flow. The obtained results are a support to safety analyses of thermal power plants under transient conditions.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure",
pages = "2224-2213",
number = "3",
volume = "24",
doi = "10.2298/TSCI190915426S"
}

Stevanović, V., Milivojević, S.,& Petrović, M. M.. (2020). Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 24(3), 2213-2224.
https://doi.org/10.2298/TSCI190915426S

Stevanović V, Milivojević S, Petrović MM. Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure. in Thermal Science. 2020;24(3):2213-2224.
doi:10.2298/TSCI190915426S .

Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., "Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure" in Thermal Science, 24, no. 3 (2020):2213-2224,
https://doi.org/10.2298/TSCI190915426S . .

TY  - JOUR
AU  - Vasić, Mihailo
AU  - Stevanović, Vladimir
AU  - Zivković, Branislav
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3402
AB  - The main purpose of ventilation system is to meet the requirements of thermal comfort and air quality for the occupants. HVAC designers select air supply devices by using manufacturers' data, under the assumption that the outflow from the elements is uniform and radially symmetric. Uniformity and symmetry hold only if air velocity vectors have uniform intensities and directions that are perpendicular to the diffuser inlet cross section. Unfortunately, these conditions are hardly met in the engineering practice. The most common case of diffuser installation is the flush ceiling installation, accompanied with the plenum box with side entry above the ceiling. Therefore, in the present article investigated is the influence of different geometries of the equalizing elements in the plenum box with the side entry connection on the symmetry of the jet and the flow distribution through the four-sided square ceiling diffuser. New designs of the plenum box with an inclined non-uniformly perforated plate and with an equalizing element with air guidance blades are proposed and evaluated numerically and experimentally. A better uniformity of the air discharge from the diffuser outlet to the ventilated room is achieved.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Science and Technology For The Built Environment
T1  - Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry
EP  - 686
IS  - 5
SP  - 676
VL  - 26
DO  - 10.1080/23744731.2020.1730124
ER  - 

@article{
author = "Vasić, Mihailo and Stevanović, Vladimir and Zivković, Branislav",
year = "2020",
abstract = "The main purpose of ventilation system is to meet the requirements of thermal comfort and air quality for the occupants. HVAC designers select air supply devices by using manufacturers' data, under the assumption that the outflow from the elements is uniform and radially symmetric. Uniformity and symmetry hold only if air velocity vectors have uniform intensities and directions that are perpendicular to the diffuser inlet cross section. Unfortunately, these conditions are hardly met in the engineering practice. The most common case of diffuser installation is the flush ceiling installation, accompanied with the plenum box with side entry above the ceiling. Therefore, in the present article investigated is the influence of different geometries of the equalizing elements in the plenum box with the side entry connection on the symmetry of the jet and the flow distribution through the four-sided square ceiling diffuser. New designs of the plenum box with an inclined non-uniformly perforated plate and with an equalizing element with air guidance blades are proposed and evaluated numerically and experimentally. A better uniformity of the air discharge from the diffuser outlet to the ventilated room is achieved.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Science and Technology For The Built Environment",
title = "Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry",
pages = "686-676",
number = "5",
volume = "26",
doi = "10.1080/23744731.2020.1730124"
}

Vasić, M., Stevanović, V.,& Zivković, B.. (2020). Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry. in Science and Technology For The Built Environment
Taylor & Francis Inc, Philadelphia., 26(5), 676-686.
https://doi.org/10.1080/23744731.2020.1730124

Vasić M, Stevanović V, Zivković B. Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry. in Science and Technology For The Built Environment. 2020;26(5):676-686.
doi:10.1080/23744731.2020.1730124 .

Vasić, Mihailo, Stevanović, Vladimir, Zivković, Branislav, "Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry" in Science and Technology For The Built Environment, 26, no. 5 (2020):676-686,
https://doi.org/10.1080/23744731.2020.1730124 . .

TY  - CONF
AU  - Petrović, Milan M.
AU  - Stevanović, Vladimir
AU  - Ilić, Milica
AU  - Milivojević, Sanja
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4521
AB  - Ključanje je fenomen koji se odvija u procesnim, termoenergetskim i hemijskim postrojenjima i 
opremi. Precizno predviđanje koeficijenta prelaza toplote pri projektovanju i dimenzionisanju 
opreme u kojoj se odvija ključanje je veoma važno sa stanovišta sigurnosti i pouzdanosti rada. U 
ovom radu su prikazani rezultati numeričkog istraživanja bazenskog ključanja i mehanizama 
razmene toplote između zagrejačkog zida i ključajućeg fluida. Numeričko istraživanje je bazirano 
na formiranju modela za zagrejački zid kao i primeni modela dva fluida za dvofaznu mešavinu 
tečne i parne faze. Model zagrejačkog zida je zasnovan na rešavanju jednačine nestacionarnog 
provođenja toplote, dok je model dva fluida zasnovan na rešavanju jednačina bilansa mase, 
količine kretanja i energije za tečnu i parnu fazu posebno. Spregnutost ova dva modela je ostvarena 
uzimanjem u obzir mikro parametara, kao i odgovarajućim modeliranjem prenosa toplote na 
mestima gde nastaje mehur i prenosa toplote na tečni film koji okružuje mehurove. Razvijeni model 
uzima u obzir broj mesta nukleacije, prečnik mehura, vreme zadržavanja mehura na zagrejačkom 
zidu i ugao kvašenja kao parametre koji određuju dinamiku ključanja. Takođe, analizirano je kako 
ugao kvašenja, različite vrste materijala zagrejačkog zida pri različitim vrednostima toplotnih 
flukseva utiču na pregrejanje zida. Prikazani rezultati su upoređeni sa izmerenim vrednostima 
dostupnim u literaturi i ostvarena su zadovoljavajuća slaganja.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)
C3  - 32. Međunarodni kongres o procesnoj industriji - Procesing 2019, Beograd, Srbija, 30-31. maj 2019
T1  - Numeričko istraživanje bazenskog ključanja i mehanizama razmene toplote na zagrejačkom zidu
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4521
ER  - 

@conference{
author = "Petrović, Milan M. and Stevanović, Vladimir and Ilić, Milica and Milivojević, Sanja",
year = "2019",
abstract = "Ključanje je fenomen koji se odvija u procesnim, termoenergetskim i hemijskim postrojenjima i 
opremi. Precizno predviđanje koeficijenta prelaza toplote pri projektovanju i dimenzionisanju 
opreme u kojoj se odvija ključanje je veoma važno sa stanovišta sigurnosti i pouzdanosti rada. U 
ovom radu su prikazani rezultati numeričkog istraživanja bazenskog ključanja i mehanizama 
razmene toplote između zagrejačkog zida i ključajućeg fluida. Numeričko istraživanje je bazirano 
na formiranju modela za zagrejački zid kao i primeni modela dva fluida za dvofaznu mešavinu 
tečne i parne faze. Model zagrejačkog zida je zasnovan na rešavanju jednačine nestacionarnog 
provođenja toplote, dok je model dva fluida zasnovan na rešavanju jednačina bilansa mase, 
količine kretanja i energije za tečnu i parnu fazu posebno. Spregnutost ova dva modela je ostvarena 
uzimanjem u obzir mikro parametara, kao i odgovarajućim modeliranjem prenosa toplote na 
mestima gde nastaje mehur i prenosa toplote na tečni film koji okružuje mehurove. Razvijeni model 
uzima u obzir broj mesta nukleacije, prečnik mehura, vreme zadržavanja mehura na zagrejačkom 
zidu i ugao kvašenja kao parametre koji određuju dinamiku ključanja. Takođe, analizirano je kako 
ugao kvašenja, različite vrste materijala zagrejačkog zida pri različitim vrednostima toplotnih 
flukseva utiču na pregrejanje zida. Prikazani rezultati su upoređeni sa izmerenim vrednostima 
dostupnim u literaturi i ostvarena su zadovoljavajuća slaganja.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)",
journal = "32. Međunarodni kongres o procesnoj industriji - Procesing 2019, Beograd, Srbija, 30-31. maj 2019",
title = "Numeričko istraživanje bazenskog ključanja i mehanizama razmene toplote na zagrejačkom zidu",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4521"
}

Petrović, M. M., Stevanović, V., Ilić, M.,& Milivojević, S.. (2019). Numeričko istraživanje bazenskog ključanja i mehanizama razmene toplote na zagrejačkom zidu. in 32. Međunarodni kongres o procesnoj industriji - Procesing 2019, Beograd, Srbija, 30-31. maj 2019
Beograd : Savez mašinskih i elektrotehničkih inženjera Srbije (SMEITS)..
https://hdl.handle.net/21.15107/rcub_machinery_4521

Petrović MM, Stevanović V, Ilić M, Milivojević S. Numeričko istraživanje bazenskog ključanja i mehanizama razmene toplote na zagrejačkom zidu. in 32. Međunarodni kongres o procesnoj industriji - Procesing 2019, Beograd, Srbija, 30-31. maj 2019. 2019;.
https://hdl.handle.net/21.15107/rcub_machinery_4521 .

Petrović, Milan M., Stevanović, Vladimir, Ilić, Milica, Milivojević, Sanja, "Numeričko istraživanje bazenskog ključanja i mehanizama razmene toplote na zagrejačkom zidu" in 32. Međunarodni kongres o procesnoj industriji - Procesing 2019, Beograd, Srbija, 30-31. maj 2019 (2019),
https://hdl.handle.net/21.15107/rcub_machinery_4521 .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Wala, Tadeusz
AU  - Milivojević, Sanja
AU  - Ilić, Milica
AU  - Muszynski, Slawomir
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3059
AB  - A substantial potential exists for the recovery of flue gas waste heat at aged coal-fired power plants. High and low pressure economizers (HPE, LPE) can be applied for this purpose. Two cases of the feedwater supply to the HPE are considered: a supply of the "cold" feedwater taken from the feedwater pump discharge line and a supply of the "hot" feedwater taken after high pressure heaters. The LPE is fed by condensate taken from the low pressure condensate line. The heat transfer area of economizers is equal in all cases. The heat transfer rate of the LPE is maximized by the lowest possible condensate temperature at the economizer inlet, which is limited by the acid dew point temperature. The power upgrade by the HPE fed with the "cold" feedwater is by 2.5 times higher than in case with the LPE. The plant efficiency upgrade by the LPE is by 20% higher than in case with the HPE fed with "cold" feedwater. The HPE fed with the hot feedwater is not competitive. The presented overall benefits achieved by the HPE fed with the cold feedwater justify its implementation at the aged 620 MWe power plant.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy
T1  - Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation
SP  - 115980
VL  - 187
DO  - 10.1016/j.energy.2019.115980
ER  - 

@article{
author = "Stevanović, Vladimir and Petrović, Milan M. and Wala, Tadeusz and Milivojević, Sanja and Ilić, Milica and Muszynski, Slawomir",
year = "2019",
abstract = "A substantial potential exists for the recovery of flue gas waste heat at aged coal-fired power plants. High and low pressure economizers (HPE, LPE) can be applied for this purpose. Two cases of the feedwater supply to the HPE are considered: a supply of the "cold" feedwater taken from the feedwater pump discharge line and a supply of the "hot" feedwater taken after high pressure heaters. The LPE is fed by condensate taken from the low pressure condensate line. The heat transfer area of economizers is equal in all cases. The heat transfer rate of the LPE is maximized by the lowest possible condensate temperature at the economizer inlet, which is limited by the acid dew point temperature. The power upgrade by the HPE fed with the "cold" feedwater is by 2.5 times higher than in case with the LPE. The plant efficiency upgrade by the LPE is by 20% higher than in case with the HPE fed with "cold" feedwater. The HPE fed with the hot feedwater is not competitive. The presented overall benefits achieved by the HPE fed with the cold feedwater justify its implementation at the aged 620 MWe power plant.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy",
title = "Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation",
pages = "115980",
volume = "187",
doi = "10.1016/j.energy.2019.115980"
}

Stevanović, V., Petrović, M. M., Wala, T., Milivojević, S., Ilić, M.,& Muszynski, S.. (2019). Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation. in Energy
Pergamon-Elsevier Science Ltd, Oxford., 187, 115980.
https://doi.org/10.1016/j.energy.2019.115980

Stevanović V, Petrović MM, Wala T, Milivojević S, Ilić M, Muszynski S. Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation. in Energy. 2019;187:115980.
doi:10.1016/j.energy.2019.115980 .

Stevanović, Vladimir, Petrović, Milan M., Wala, Tadeusz, Milivojević, Sanja, Ilić, Milica, Muszynski, Slawomir, "Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation" in Energy, 187 (2019):115980,
https://doi.org/10.1016/j.energy.2019.115980 . .

TY  - JOUR
AU  - Ilić, Milica
AU  - Petrović, Milan M.
AU  - Stevanović, Vladimir
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3046
AB  - This paper reviews the current status of boiling heat transfer modelling, discusses the need for its improvement due to unresolved intriguing experimental findings and emergence of novel technical applications and outlines the directions for an advanced modelling approach. The state-of-the-art of computational boiling heat transfer studies is given for: macro-scale boiling models applied in two-fluid liquid-vapour interpenetrating media approach, micro-, meso-scale boiling computations by interface capturing methods, and nano-scale boiling simulations by molecular dynamics tools. Advantages, limitations and shortcomings of each approach, which originate from its grounding formulations, are discussed and illustrated on results obtained by the boiling model developed in our research group. Based on these issues, we stress the importance of adaptation of a multi-scale approach for development of an advanced boiling predictive methodology. A general road-map is outlined for achieving this challenging goal, which should include: improvement of existing methods for computation of boiling on different scales and development of conceptually new algorithms for linking of individual scale methods. As dramatically different time steps of integration for different boiling scales hinder the application of full multi-scale methodology on boiling problems of practical significance, we emphasise the importance of development of another algorithm for the determination of sub-domains within a macro-scale boiling region, which are relevant for conductance of small-scale simulations.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Boiling heat transfer modelling a review and future prospectus
EP  - 107
IS  - 1
SP  - 87
VL  - 23
DO  - 10.2298/TSCI180725249I
ER  - 

@article{
author = "Ilić, Milica and Petrović, Milan M. and Stevanović, Vladimir",
year = "2019",
abstract = "This paper reviews the current status of boiling heat transfer modelling, discusses the need for its improvement due to unresolved intriguing experimental findings and emergence of novel technical applications and outlines the directions for an advanced modelling approach. The state-of-the-art of computational boiling heat transfer studies is given for: macro-scale boiling models applied in two-fluid liquid-vapour interpenetrating media approach, micro-, meso-scale boiling computations by interface capturing methods, and nano-scale boiling simulations by molecular dynamics tools. Advantages, limitations and shortcomings of each approach, which originate from its grounding formulations, are discussed and illustrated on results obtained by the boiling model developed in our research group. Based on these issues, we stress the importance of adaptation of a multi-scale approach for development of an advanced boiling predictive methodology. A general road-map is outlined for achieving this challenging goal, which should include: improvement of existing methods for computation of boiling on different scales and development of conceptually new algorithms for linking of individual scale methods. As dramatically different time steps of integration for different boiling scales hinder the application of full multi-scale methodology on boiling problems of practical significance, we emphasise the importance of development of another algorithm for the determination of sub-domains within a macro-scale boiling region, which are relevant for conductance of small-scale simulations.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Boiling heat transfer modelling a review and future prospectus",
pages = "107-87",
number = "1",
volume = "23",
doi = "10.2298/TSCI180725249I"
}

Ilić, M., Petrović, M. M.,& Stevanović, V.. (2019). Boiling heat transfer modelling a review and future prospectus. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(1), 87-107.
https://doi.org/10.2298/TSCI180725249I

Ilić M, Petrović MM, Stevanović V. Boiling heat transfer modelling a review and future prospectus. in Thermal Science. 2019;23(1):87-107.
doi:10.2298/TSCI180725249I .

Ilić, Milica, Petrović, Milan M., Stevanović, Vladimir, "Boiling heat transfer modelling a review and future prospectus" in Thermal Science, 23, no. 1 (2019):87-107,
https://doi.org/10.2298/TSCI180725249I . .

TY  - CONF
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Milivojević, Sanja
AU  - Ilić, Milica
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4490
AB  - Thermal power plants are forced to operate under frequent load changes in energy 
systems with increased share of solar and wind power plants. These load changes 
increase thermal power plant aging and reduce their efficiency. Therefore, solutions for 
energy storage are sought in order to accumulate energy in periods of lower power 
demand and produce excess power in periods of increased demands. In the present 
paper the application of the steam accumulator is evaluated to provide the thermal 
energy storage in the coal-fired thermal power plant and to increase its flexibility under 
the demand for the variable load changes. The steam accumulator is charged during 
periods of lower power demand, as during the night hours, and discharged during peak 
load demands. The steam accumulator is charged by the steam extracted from the steam 
turbine. The steam discharged from the steam accumulator increases the steam flow rate 
through the turbine and the turbine power. Investigated are possible technical solutions 
with the steam accumulator installations in the power plant. The upgrade of power plant 
flexibility by steam accumulator is demonstrated. The corresponding operating 
parameters and energy benefits are calculated.
PB  - Silesian University of Technology (PolSL)
C3  - ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Wroclaw, Poland, June 23-28, 2019
T1  - Upgrade of the thermal power plant flexibility by the steam accumulator
EP  - 2960
SP  - 2951
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4490
ER  - 

@conference{
author = "Stevanović, Vladimir and Petrović, Milan M. and Milivojević, Sanja and Ilić, Milica",
year = "2019",
abstract = "Thermal power plants are forced to operate under frequent load changes in energy 
systems with increased share of solar and wind power plants. These load changes 
increase thermal power plant aging and reduce their efficiency. Therefore, solutions for 
energy storage are sought in order to accumulate energy in periods of lower power 
demand and produce excess power in periods of increased demands. In the present 
paper the application of the steam accumulator is evaluated to provide the thermal 
energy storage in the coal-fired thermal power plant and to increase its flexibility under 
the demand for the variable load changes. The steam accumulator is charged during 
periods of lower power demand, as during the night hours, and discharged during peak 
load demands. The steam accumulator is charged by the steam extracted from the steam 
turbine. The steam discharged from the steam accumulator increases the steam flow rate 
through the turbine and the turbine power. Investigated are possible technical solutions 
with the steam accumulator installations in the power plant. The upgrade of power plant 
flexibility by steam accumulator is demonstrated. The corresponding operating 
parameters and energy benefits are calculated.",
publisher = "Silesian University of Technology (PolSL)",
journal = "ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Wroclaw, Poland, June 23-28, 2019",
title = "Upgrade of the thermal power plant flexibility by the steam accumulator",
pages = "2960-2951",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4490"
}

Stevanović, V., Petrović, M. M., Milivojević, S.,& Ilić, M.. (2019). Upgrade of the thermal power plant flexibility by the steam accumulator. in ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Wroclaw, Poland, June 23-28, 2019
Silesian University of Technology (PolSL)., 2951-2960.
https://hdl.handle.net/21.15107/rcub_machinery_4490

Stevanović V, Petrović MM, Milivojević S, Ilić M. Upgrade of the thermal power plant flexibility by the steam accumulator. in ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Wroclaw, Poland, June 23-28, 2019. 2019;:2951-2960.
https://hdl.handle.net/21.15107/rcub_machinery_4490 .

Stevanović, Vladimir, Petrović, Milan M., Milivojević, Sanja, Ilić, Milica, "Upgrade of the thermal power plant flexibility by the steam accumulator" in ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Wroclaw, Poland, June 23-28, 2019 (2019):2951-2960,
https://hdl.handle.net/21.15107/rcub_machinery_4490 .

TY  - CONF
AU  - Živić, Dragan
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Petrović, Milan M.
AU  - Kesić, Đura
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4495
AB  - In order to reach designed power output of 2 x 348.5MW at two units of the Thermal 
power plant Kostolac B, a number of modernization and reconstruction activities are performed 
as well as static and dynamic fresh steam pipeline stress analysis. All overhauls and retrofits 
are conducted with aim to increase plant efficiency and reduce environmental pollution. In 
order to reach the design power, it was determined that it is necessary to increase the fresh 
steam flow rate from 1000 t/h to 1060 t/h. In this paper, the calculation methodology and 
obtained results of pipeline stress analysis of the fresh steam pipeline with new operational 
conditions are presented. Maximal fresh steam pipeline loads are determined in cases of 
transient conditions. The results of the pipeline stress analyses are presented together with the 
determined support loads and hangings. The steam pipeline operational parameter are analysed 
during trips and shut-offs, cold and hot start-ups and drainage conditions. Obtained results are 
support for the safety analyses and operational conditions determination.
PB  - University of Kragujevac Faculty of Engineering Department for Mechanical Constructions and Mechanization
C3  - Proceedings of the The 9th International Scientific Conference - IRMES 2019 Research and Development of Mechanical Elements and Systems, Kragujevac, Serbia, September 5-7, 2019
T1  - Calculation methodology and results of pipeline stress analysis, supports and steam pipeline hanging reconstruction for RA fresh steam pipeline at Power plant Kostolac B with increased fresh steam flow rate of 1060 t/h and new operational conditions
SP  - 66
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4495
ER  - 

@conference{
author = "Živić, Dragan and Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M. and Kesić, Đura",
year = "2019",
abstract = "In order to reach designed power output of 2 x 348.5MW at two units of the Thermal 
power plant Kostolac B, a number of modernization and reconstruction activities are performed 
as well as static and dynamic fresh steam pipeline stress analysis. All overhauls and retrofits 
are conducted with aim to increase plant efficiency and reduce environmental pollution. In 
order to reach the design power, it was determined that it is necessary to increase the fresh 
steam flow rate from 1000 t/h to 1060 t/h. In this paper, the calculation methodology and 
obtained results of pipeline stress analysis of the fresh steam pipeline with new operational 
conditions are presented. Maximal fresh steam pipeline loads are determined in cases of 
transient conditions. The results of the pipeline stress analyses are presented together with the 
determined support loads and hangings. The steam pipeline operational parameter are analysed 
during trips and shut-offs, cold and hot start-ups and drainage conditions. Obtained results are 
support for the safety analyses and operational conditions determination.",
publisher = "University of Kragujevac Faculty of Engineering Department for Mechanical Constructions and Mechanization",
journal = "Proceedings of the The 9th International Scientific Conference - IRMES 2019 Research and Development of Mechanical Elements and Systems, Kragujevac, Serbia, September 5-7, 2019",
title = "Calculation methodology and results of pipeline stress analysis, supports and steam pipeline hanging reconstruction for RA fresh steam pipeline at Power plant Kostolac B with increased fresh steam flow rate of 1060 t/h and new operational conditions",
pages = "66",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4495"
}

Živić, D., Stevanović, V., Milivojević, S., Petrović, M. M.,& Kesić, Đ.. (2019). Calculation methodology and results of pipeline stress analysis, supports and steam pipeline hanging reconstruction for RA fresh steam pipeline at Power plant Kostolac B with increased fresh steam flow rate of 1060 t/h and new operational conditions. in Proceedings of the The 9th International Scientific Conference - IRMES 2019 Research and Development of Mechanical Elements and Systems, Kragujevac, Serbia, September 5-7, 2019
University of Kragujevac Faculty of Engineering Department for Mechanical Constructions and Mechanization., 66.
https://hdl.handle.net/21.15107/rcub_machinery_4495

Živić D, Stevanović V, Milivojević S, Petrović MM, Kesić Đ. Calculation methodology and results of pipeline stress analysis, supports and steam pipeline hanging reconstruction for RA fresh steam pipeline at Power plant Kostolac B with increased fresh steam flow rate of 1060 t/h and new operational conditions. in Proceedings of the The 9th International Scientific Conference - IRMES 2019 Research and Development of Mechanical Elements and Systems, Kragujevac, Serbia, September 5-7, 2019. 2019;:66.
https://hdl.handle.net/21.15107/rcub_machinery_4495 .

Živić, Dragan, Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., Kesić, Đura, "Calculation methodology and results of pipeline stress analysis, supports and steam pipeline hanging reconstruction for RA fresh steam pipeline at Power plant Kostolac B with increased fresh steam flow rate of 1060 t/h and new operational conditions" in Proceedings of the The 9th International Scientific Conference - IRMES 2019 Research and Development of Mechanical Elements and Systems, Kragujevac, Serbia, September 5-7, 2019 (2019):66,
https://hdl.handle.net/21.15107/rcub_machinery_4495 .

TY  - JOUR
AU  - Gajić, A.
AU  - Stevanović, Vladimir
AU  - Pejović, S.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3175
AB  - The new world energy policy is influenced by climate changes, narrow range of operation of Thermal Power Plants, potential risks of Nuclear Power Plants and limited resources of oil, gas and coal. Taking into account that renewable energy, solar and wind power particularly are very dependent on the climate, Hydro Power takes a new role in energy systems. Electricity conversion and storage in periods of lower consumption and electricity production from the stored energy in periods of higher demand or reduced production, are crucial for the maintenance of stable and efficient electrical system. This requirement has especially strengthened nowadays due to the expansion of integration of new wind and solar plants. These renewable sources are characterized with inherent intermittent production both in daily periods and periods of several days, weeks or even months. A number of technologies might be considered for the electricity conversion and storage, but the only nature and high capacity available technology is based on the pumped storage plants. This article studies the potential of the pumped storage plants as the effective and economically competitive technology for the storage of wind, solar, run-of-river and other environmentally friendly energies. Nuclear and coal fired plants can change power output to achieve demand but only at the price of extremely high maintenance cost. In addition, natural gas generators contribute to climate change and pollution only slightly less than coal. The pumped storage method is the most common storage system in the electricity sector. It is traditionally dependent on natural conditions, usually making use of rivers or lakes. However, some innovative methods such as the use of the sea as the lower reservoir, or a proposal to use a surface reservoir as the upper reservoir and an underground reservoir as the lower have emerged. Analyses indicate that there is a strong economic incentive for further investment in pumpedstorage installations when other hydro storages and sites are not available.
PB  - Turbomachinery Society of Japan
T2  - International Journal of Fluid Machinery and Systems
T1  - Pumped-hydro storages are balancing electric energy production of wind and solar reducing average costs and pollution
EP  - 55
IS  - 1
SP  - 47
VL  - 12
DO  - 10.5293/IJFMS.2019.12.1.047
ER  - 

@article{
author = "Gajić, A. and Stevanović, Vladimir and Pejović, S.",
year = "2019",
abstract = "The new world energy policy is influenced by climate changes, narrow range of operation of Thermal Power Plants, potential risks of Nuclear Power Plants and limited resources of oil, gas and coal. Taking into account that renewable energy, solar and wind power particularly are very dependent on the climate, Hydro Power takes a new role in energy systems. Electricity conversion and storage in periods of lower consumption and electricity production from the stored energy in periods of higher demand or reduced production, are crucial for the maintenance of stable and efficient electrical system. This requirement has especially strengthened nowadays due to the expansion of integration of new wind and solar plants. These renewable sources are characterized with inherent intermittent production both in daily periods and periods of several days, weeks or even months. A number of technologies might be considered for the electricity conversion and storage, but the only nature and high capacity available technology is based on the pumped storage plants. This article studies the potential of the pumped storage plants as the effective and economically competitive technology for the storage of wind, solar, run-of-river and other environmentally friendly energies. Nuclear and coal fired plants can change power output to achieve demand but only at the price of extremely high maintenance cost. In addition, natural gas generators contribute to climate change and pollution only slightly less than coal. The pumped storage method is the most common storage system in the electricity sector. It is traditionally dependent on natural conditions, usually making use of rivers or lakes. However, some innovative methods such as the use of the sea as the lower reservoir, or a proposal to use a surface reservoir as the upper reservoir and an underground reservoir as the lower have emerged. Analyses indicate that there is a strong economic incentive for further investment in pumpedstorage installations when other hydro storages and sites are not available.",
publisher = "Turbomachinery Society of Japan",
journal = "International Journal of Fluid Machinery and Systems",
title = "Pumped-hydro storages are balancing electric energy production of wind and solar reducing average costs and pollution",
pages = "55-47",
number = "1",
volume = "12",
doi = "10.5293/IJFMS.2019.12.1.047"
}

Gajić, A., Stevanović, V.,& Pejović, S.. (2019). Pumped-hydro storages are balancing electric energy production of wind and solar reducing average costs and pollution. in International Journal of Fluid Machinery and Systems
Turbomachinery Society of Japan., 12(1), 47-55.
https://doi.org/10.5293/IJFMS.2019.12.1.047

Gajić A, Stevanović V, Pejović S. Pumped-hydro storages are balancing electric energy production of wind and solar reducing average costs and pollution. in International Journal of Fluid Machinery and Systems. 2019;12(1):47-55.
doi:10.5293/IJFMS.2019.12.1.047 .

Gajić, A., Stevanović, Vladimir, Pejović, S., "Pumped-hydro storages are balancing electric energy production of wind and solar reducing average costs and pollution" in International Journal of Fluid Machinery and Systems, 12, no. 1 (2019):47-55,
https://doi.org/10.5293/IJFMS.2019.12.1.047 . .

TY  - JOUR
AU  - Alghlam, Abdoalmonaim S. M.
AU  - Stevanović, Vladimir
AU  - Elgazdori, Elmukhtar A.
AU  - Banjac, Miloš
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2995
AB  - Simulations of natural gas pipeline transients provide an insight into a pipeline capacity to deliver gas to consumers or to accumulate gas from source wells during various abnormal conditions and under variable consumption rates. This information is used for the control of gas pressure and for planning repairs in a timely manner. Therefore, a numerical model and a computer code have been developed for the simulation of natural gas transients in pipelines. The developed approach is validated by simulations of test cases from the open literature. Detailed analyses of both slow and fast gas flow transients are presented. Afterward, the code is applied to the simulation of transients in a long natural gas transmission pipeline. The simulated scenarios cover common operating conditions and abrupt disturbances. The simulations of the abnormal conditions show a significant accumulation capacity and inertia of the gas within the pipeline, which enables gas packing and consumers supply during the day time period. Since the numerical results are obtained under isothermal gas transient conditions, an analytical method for the evaluation of the difference between isothermal and nonisothermal predictions is derived. It is concluded that the non isothermal transient effects can be neglected in engineering predictions of natural gas packing in long pipelines during several hours. The prescribed isothermal temperature should be a few degrees higher than the soil temperature due to the heat generation by friction on the pipelines wall and heat transfer from the gas to the surrounding soil.
PB  - ASME, New York
T2  - Journal of Energy Resources Technology-Transactions of The Asme
T1  - Numerical Simulation of Natural Gas Pipeline Transients
IS  - 10
VL  - 141
DO  - 10.1115/1.4043436
ER  - 

@article{
author = "Alghlam, Abdoalmonaim S. M. and Stevanović, Vladimir and Elgazdori, Elmukhtar A. and Banjac, Miloš",
year = "2019",
abstract = "Simulations of natural gas pipeline transients provide an insight into a pipeline capacity to deliver gas to consumers or to accumulate gas from source wells during various abnormal conditions and under variable consumption rates. This information is used for the control of gas pressure and for planning repairs in a timely manner. Therefore, a numerical model and a computer code have been developed for the simulation of natural gas transients in pipelines. The developed approach is validated by simulations of test cases from the open literature. Detailed analyses of both slow and fast gas flow transients are presented. Afterward, the code is applied to the simulation of transients in a long natural gas transmission pipeline. The simulated scenarios cover common operating conditions and abrupt disturbances. The simulations of the abnormal conditions show a significant accumulation capacity and inertia of the gas within the pipeline, which enables gas packing and consumers supply during the day time period. Since the numerical results are obtained under isothermal gas transient conditions, an analytical method for the evaluation of the difference between isothermal and nonisothermal predictions is derived. It is concluded that the non isothermal transient effects can be neglected in engineering predictions of natural gas packing in long pipelines during several hours. The prescribed isothermal temperature should be a few degrees higher than the soil temperature due to the heat generation by friction on the pipelines wall and heat transfer from the gas to the surrounding soil.",
publisher = "ASME, New York",
journal = "Journal of Energy Resources Technology-Transactions of The Asme",
title = "Numerical Simulation of Natural Gas Pipeline Transients",
number = "10",
volume = "141",
doi = "10.1115/1.4043436"
}

Alghlam, A. S. M., Stevanović, V., Elgazdori, E. A.,& Banjac, M.. (2019). Numerical Simulation of Natural Gas Pipeline Transients. in Journal of Energy Resources Technology-Transactions of The Asme
ASME, New York., 141(10).
https://doi.org/10.1115/1.4043436

Alghlam ASM, Stevanović V, Elgazdori EA, Banjac M. Numerical Simulation of Natural Gas Pipeline Transients. in Journal of Energy Resources Technology-Transactions of The Asme. 2019;141(10).
doi:10.1115/1.4043436 .

Alghlam, Abdoalmonaim S. M., Stevanović, Vladimir, Elgazdori, Elmukhtar A., Banjac, Miloš, "Numerical Simulation of Natural Gas Pipeline Transients" in Journal of Energy Resources Technology-Transactions of The Asme, 141, no. 10 (2019),
https://doi.org/10.1115/1.4043436 . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Ilić, Milica
AU  - Djurović, Željko
AU  - Wala, Tadeusz
AU  - Muszynski, Slawomir
AU  - Gajić, Ivan
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2939
AB  - Coal-fired thermal power plants (TPPs) had been generally designed to cover base loads of electricity consumption. Nowadays, they should be flexible to participate in the primary frequency control of electric system, especially because of increased number of wind and solar plants with intermittent electricity production. In this paper a new method for the primary power control in TPPs is presented, based on the feedwater flow rate changes between the feedwater heaters (FWHs) and an additional high pressure economizer. The achieved primary power control reserve is demonstrated by measurements at the lignite-fired 650 MWe TPP after its retrofit by the installation of the high pressure economizer in parallel with FWHs. In addition, the TPP transient operation during the primary control are simulated and analyzed with the developed thermal-hydraulic model of the steam turbine heat regeneration system. The control reserve of approximately 10 MWe is shown both by measured data and results of numerical simulations. The control reserve is originally provided by the fresh steam throttling in front of the turbine, but this throttling can be reduced by the application of the new method. The rates of change of wall temperatures of FWHs tubes are within allowed limits during the transients.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy
T1  - Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B"
EP  - 798
SP  - 782
VL  - 147
DO  - 10.1016/j.energy.2018.01.102
ER  - 

@article{
author = "Stevanović, Vladimir and Ilić, Milica and Djurović, Željko and Wala, Tadeusz and Muszynski, Slawomir and Gajić, Ivan",
year = "2018",
abstract = "Coal-fired thermal power plants (TPPs) had been generally designed to cover base loads of electricity consumption. Nowadays, they should be flexible to participate in the primary frequency control of electric system, especially because of increased number of wind and solar plants with intermittent electricity production. In this paper a new method for the primary power control in TPPs is presented, based on the feedwater flow rate changes between the feedwater heaters (FWHs) and an additional high pressure economizer. The achieved primary power control reserve is demonstrated by measurements at the lignite-fired 650 MWe TPP after its retrofit by the installation of the high pressure economizer in parallel with FWHs. In addition, the TPP transient operation during the primary control are simulated and analyzed with the developed thermal-hydraulic model of the steam turbine heat regeneration system. The control reserve of approximately 10 MWe is shown both by measured data and results of numerical simulations. The control reserve is originally provided by the fresh steam throttling in front of the turbine, but this throttling can be reduced by the application of the new method. The rates of change of wall temperatures of FWHs tubes are within allowed limits during the transients.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy",
title = "Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B"",
pages = "798-782",
volume = "147",
doi = "10.1016/j.energy.2018.01.102"
}

Stevanović, V., Ilić, M., Djurović, Ž., Wala, T., Muszynski, S.,& Gajić, I.. (2018). Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B". in Energy
Pergamon-Elsevier Science Ltd, Oxford., 147, 782-798.
https://doi.org/10.1016/j.energy.2018.01.102

Stevanović V, Ilić M, Djurović Ž, Wala T, Muszynski S, Gajić I. Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B". in Energy. 2018;147:782-798.
doi:10.1016/j.energy.2018.01.102 .

Stevanović, Vladimir, Ilić, Milica, Djurović, Željko, Wala, Tadeusz, Muszynski, Slawomir, Gajić, Ivan, "Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B"" in Energy, 147 (2018):782-798,
https://doi.org/10.1016/j.energy.2018.01.102 . .