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《Journal of Zhejiang University(Engineering Science)》 2018-05
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Surface wicking effect on boiling heat transfer during quenching

MOU Lin-wei;ZHANG Yu-hong;LI Jia-qi;ZHANG Jia-yi;JIANG Ping;FAN Li-wu;Institute of Thermal Science and Power Systems,Zhejiang University;Beijing Institute of Astronautical System Engineering;  
The effect of surface wicking on the cooling rate and boiling heat transfer during quenching was analyzed.Stainless steel sphere samples with various surface wicking abilities were prepared by varying the etching time in a hydrofluoric acid solution(mass concentration of about 50%)at a constant temperature of50 ℃.The wicking volume and initial wicking flux on these sample surfaces were quantified.Visualized quenching experiments were performed on these samples in saturated water at the atmospheric pressure.Water could not be wicked by the original stainless steel surface,and surface wicking ability was gradually enhanced with increasing the etching time.After being etched by 3 minutes,the surface wicking flux reached 20μL/(mm2·s).As compared to the original surface,the use of this wicking surface was exhibited to shorten the cool-down time by about 80%,and the critical heat flux was improved by about84%.The construction of surface wicking can increase the solid-liquid contact areas and intensify the fluctuations of vapor film,suppress the emergence of stable film boiling,and lead to significant heat transfer enhancement during transition boiling.
【Fund】: 国家自然科学基金资助项目(51206142)
【CateGory Index】: TK124
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