期刊
CASE STUDIES IN THERMAL ENGINEERING
卷 52, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.csite.2023.103735
关键词
Microchannel with restrictor; Micro-scale cavitation; Scale effect; Thermal effect; Surface roughness
A modified cavitation model for micro-scale flow is proposed and verified in this study. The impact of surface roughness on cavitation flow is investigated.
Cavitation can induce drastic disruption and significantly enhance heat transfer, especially in microchannels. However, due to the scale effect, the cavitation characteristics in micro-scale can be significantly different from those in conventional scale. A modified cavitation model according to the Rayleigh-Plesset bubble kinetic equation is formulated by including the effects of surface tension, and temperature difference between the local environment and the far-field environment. The impacts of latent heat of vaporization and condensation are introduced into the energy equation. The micro-scale cavitation model proposed in the paper is verified through comparison with experimental data. The influence of surface roughness on cavitation flow in microchannel with restrictor is then investigated. The results demonstrate that bottom surface roughness in microchannels significantly increases flow resistance, suppresses cavitation flow and causes high frequency pressure fluctuations.
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