期刊
NANOSCALE RESEARCH LETTERS
卷 11, 期 -, 页码 1-16出版社
SPRINGER
DOI: 10.1186/s11671-016-1361-5
关键词
ZnO nanowires; Spray cooling; Droplet; Evaporation; Wettability
资金
- National Basic Research Program of China [2012CB933200]
- Science Fund for Creative Research Groups of the NSFC [51321002]
- National Natural Science Foundation of China [51406100]
A numerical and experimental investigation was conducted to analyze dropwise evaporative cooling of heated surfaces with various wettability characteristics. The surface wettability was tuned by nanostructure modifications. Spray-cooling experiments on these surfaces show that surfaces with better wettability have better heat transfer rate and higher critical heat flux (CHF). Single droplet impingement evaporative cooling of a heated surface was then investigated numerically with various wettability conditions to characterize the effect of contact angle on spray-cooling heat transfer. The volume of fluid (VOF) model with variable-time stepping was used to capture the time-dependent liquid-gas interface motion throughout the computational domain with the kinetic theory model used to predict the evaporation rate at the liquid-gas interface. The numerical results agree with the spray-cooling experiments that dropwise evaporative cooling is much better on surfaces with better wettability because of the better liquid spreading and convection, better liquid-solid contact, and stronger liquid evaporation.
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