Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations
Abstract
Analytical and theoretical discussions validated by experimental investigations are presented to comprehensively study the relation between the geometrical parameters, such as the dimensionless standoff distance and nozzle geometry, and the cavity potential energy, and void fraction to improve the performance of submerged cavitating water jets. The force generated by the collapse of cavitation clouds was employed to initiate cavitation erosion in copper test samples under various hydrodynamic and geometrical conditions. The nozzle diameter and the separation distance between the nozzle and the specimen were varied in order to determine the optimal geometrical configuration, which leads to maximal erosion rate. The damaged specimens were investigated using optical and scanning electron microscopy (SEM). The obtained results - along with selected, previously published works from the literature - verify the analytically derived formulas, which emphasize the connection between the dimensio...nless standoff distance, and the cavitation intensity, potential energy, void fraction, and indicate the existence of an optimal dimensionless standoff distance for maximal erosion rate. Formulas to conveniently compare the efficiency of a cavitating jet based on energy consumption and dimensionless standoff distance are also presented and demonstrated. The influence of nozzle diameter and standoff distance on the kinetic energy and the specific energy consumption was clearly observed.
Keywords:
Void fraction / Potential energy / Kinetic energy / Efficiency / Consumption energy / Cavitation / Bubble collapseSource:
International Journal of Heat and Mass Transfer, 2018, 117, 873-886Publisher:
- Pergamon-Elsevier Science Ltd, Oxford
Funding / projects:
- Ministry of Science in Libya
- Hungarian Academy of Sciences
DOI: 10.1016/j.ijheatmasstransfer.2017.10.018
ISSN: 0017-9310
WoS: 000417963300076
Scopus: 2-s2.0-85032858307
Collections
Institution/Community
Mašinski fakultetTY - JOUR AU - Hutli, Ezddin AU - Nedeljković, Miloš AU - Bonyar, Attila PY - 2018 UR - https://machinery.mas.bg.ac.rs/handle/123456789/2913 AB - Analytical and theoretical discussions validated by experimental investigations are presented to comprehensively study the relation between the geometrical parameters, such as the dimensionless standoff distance and nozzle geometry, and the cavity potential energy, and void fraction to improve the performance of submerged cavitating water jets. The force generated by the collapse of cavitation clouds was employed to initiate cavitation erosion in copper test samples under various hydrodynamic and geometrical conditions. The nozzle diameter and the separation distance between the nozzle and the specimen were varied in order to determine the optimal geometrical configuration, which leads to maximal erosion rate. The damaged specimens were investigated using optical and scanning electron microscopy (SEM). The obtained results - along with selected, previously published works from the literature - verify the analytically derived formulas, which emphasize the connection between the dimensionless standoff distance, and the cavitation intensity, potential energy, void fraction, and indicate the existence of an optimal dimensionless standoff distance for maximal erosion rate. Formulas to conveniently compare the efficiency of a cavitating jet based on energy consumption and dimensionless standoff distance are also presented and demonstrated. The influence of nozzle diameter and standoff distance on the kinetic energy and the specific energy consumption was clearly observed. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - International Journal of Heat and Mass Transfer T1 - Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations EP - 886 SP - 873 VL - 117 DO - 10.1016/j.ijheatmasstransfer.2017.10.018 ER -
@article{ author = "Hutli, Ezddin and Nedeljković, Miloš and Bonyar, Attila", year = "2018", abstract = "Analytical and theoretical discussions validated by experimental investigations are presented to comprehensively study the relation between the geometrical parameters, such as the dimensionless standoff distance and nozzle geometry, and the cavity potential energy, and void fraction to improve the performance of submerged cavitating water jets. The force generated by the collapse of cavitation clouds was employed to initiate cavitation erosion in copper test samples under various hydrodynamic and geometrical conditions. The nozzle diameter and the separation distance between the nozzle and the specimen were varied in order to determine the optimal geometrical configuration, which leads to maximal erosion rate. The damaged specimens were investigated using optical and scanning electron microscopy (SEM). The obtained results - along with selected, previously published works from the literature - verify the analytically derived formulas, which emphasize the connection between the dimensionless standoff distance, and the cavitation intensity, potential energy, void fraction, and indicate the existence of an optimal dimensionless standoff distance for maximal erosion rate. Formulas to conveniently compare the efficiency of a cavitating jet based on energy consumption and dimensionless standoff distance are also presented and demonstrated. The influence of nozzle diameter and standoff distance on the kinetic energy and the specific energy consumption was clearly observed.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "International Journal of Heat and Mass Transfer", title = "Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations", pages = "886-873", volume = "117", doi = "10.1016/j.ijheatmasstransfer.2017.10.018" }
Hutli, E., Nedeljković, M.,& Bonyar, A.. (2018). Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations. in International Journal of Heat and Mass Transfer Pergamon-Elsevier Science Ltd, Oxford., 117, 873-886. https://doi.org/10.1016/j.ijheatmasstransfer.2017.10.018
Hutli E, Nedeljković M, Bonyar A. Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations. in International Journal of Heat and Mass Transfer. 2018;117:873-886. doi:10.1016/j.ijheatmasstransfer.2017.10.018 .
Hutli, Ezddin, Nedeljković, Miloš, Bonyar, Attila, "Cavitating flow characteristics, cavity potential and kinetic energy, void fraction and geometrical parameters - Analytical and theoretical study validated by experimental investigations" in International Journal of Heat and Mass Transfer, 117 (2018):873-886, https://doi.org/10.1016/j.ijheatmasstransfer.2017.10.018 . .