Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model
Abstract
In this work, numerical simulations of upward turbulent bubbly flows in vertical pipes are conducted in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid. It is found that the existing correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used along with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is that drag forces of bubbles calculated using such correlation are enormous in near-wall cells (order of 10(12) N/m(3)), which causes a divergence of numerical simulations with LRN. Therefore, a modified correlation for the drag coefficient of a single bubble in shear flow, that can be used successfully with the LRN model, has been proposed. The results of numerical simulations, performed with a new correlation for the drag coefficient, are analysed and compared to selected experimental measurements for different pipe diameters and different flow conditions of gas and liquid. It... is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow in numerical simulations can be achieved on the reduction of the relative velocity between gas and liquid. The degree of this reduction depends on the pipe diameter and liquid volumetric flux.
Keywords:
Two-phase / multiphase CFD / low-Reynolds-number model / interfacial forces / bubbly flowsSource:
Advances in Mechanical Engineering, 2022, 14, 4Publisher:
- Sage Publications Ltd, London
Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200105 (University of Belgrade, Faculty of Mechanical Engineering) (RS-MESTD-inst-2020-200105)
- Application of Novel Measurement and Computational Techniques on Investigation of Air Flow in Ventilation Systems of Energy Extremely Efficient (“Passive”) Buildings (RS-MESTD-Technological Development (TD or TR)-35046)
DOI: 10.1177/16878132221094909
ISSN: 1687-8132
WoS: 000784376700001
Scopus: 2-s2.0-85128463008
Collections
Institution/Community
Mašinski fakultetTY - JOUR AU - Raković, Milan AU - Radenković, Darko AU - Ćoćić, Aleksandar AU - Lečić, Milan PY - 2022 UR - https://machinery.mas.bg.ac.rs/handle/123456789/3693 AB - In this work, numerical simulations of upward turbulent bubbly flows in vertical pipes are conducted in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid. It is found that the existing correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used along with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is that drag forces of bubbles calculated using such correlation are enormous in near-wall cells (order of 10(12) N/m(3)), which causes a divergence of numerical simulations with LRN. Therefore, a modified correlation for the drag coefficient of a single bubble in shear flow, that can be used successfully with the LRN model, has been proposed. The results of numerical simulations, performed with a new correlation for the drag coefficient, are analysed and compared to selected experimental measurements for different pipe diameters and different flow conditions of gas and liquid. It is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow in numerical simulations can be achieved on the reduction of the relative velocity between gas and liquid. The degree of this reduction depends on the pipe diameter and liquid volumetric flux. PB - Sage Publications Ltd, London T2 - Advances in Mechanical Engineering T1 - Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model IS - 4 VL - 14 DO - 10.1177/16878132221094909 ER -
@article{ author = "Raković, Milan and Radenković, Darko and Ćoćić, Aleksandar and Lečić, Milan", year = "2022", abstract = "In this work, numerical simulations of upward turbulent bubbly flows in vertical pipes are conducted in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid. It is found that the existing correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used along with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is that drag forces of bubbles calculated using such correlation are enormous in near-wall cells (order of 10(12) N/m(3)), which causes a divergence of numerical simulations with LRN. Therefore, a modified correlation for the drag coefficient of a single bubble in shear flow, that can be used successfully with the LRN model, has been proposed. The results of numerical simulations, performed with a new correlation for the drag coefficient, are analysed and compared to selected experimental measurements for different pipe diameters and different flow conditions of gas and liquid. It is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow in numerical simulations can be achieved on the reduction of the relative velocity between gas and liquid. The degree of this reduction depends on the pipe diameter and liquid volumetric flux.", publisher = "Sage Publications Ltd, London", journal = "Advances in Mechanical Engineering", title = "Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model", number = "4", volume = "14", doi = "10.1177/16878132221094909" }
Raković, M., Radenković, D., Ćoćić, A.,& Lečić, M.. (2022). Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model. in Advances in Mechanical Engineering Sage Publications Ltd, London., 14(4). https://doi.org/10.1177/16878132221094909
Raković M, Radenković D, Ćoćić A, Lečić M. Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model. in Advances in Mechanical Engineering. 2022;14(4). doi:10.1177/16878132221094909 .
Raković, Milan, Radenković, Darko, Ćoćić, Aleksandar, Lečić, Milan, "Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model" in Advances in Mechanical Engineering, 14, no. 4 (2022), https://doi.org/10.1177/16878132221094909 . .