文献类型：期刊文献

英文题名：Flow boiling enhancement of FC-72 from microporous surfaces in minichannels

作者：Sun, Yan[1];Zhang, Li[1];Xu, Hong[1];Zhong, Xiaocheng[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：35

期号：7

起止页码：1418

外文期刊名：EXPERIMENTAL THERMAL AND FLUID SCIENCE

收录：;EI(收录号：20113114208219);WOS:【SCI-EXPANDED(收录号:WOS:000297089400021)】；

基金：The authors are grateful for the support of the Natural Science Foundation of Shanghai under Grant No. 10ZR1408100. This paper is also supported by the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Microporous; Flow boiling; Minichannel; Confinement effect; Microchip cooling

摘要：The microporous coatings can remarkably enhance the liquid boiling heat transfer. Therefore, they are promising to be introduced into minichannels in the design of the cooling system of high-power microchips. However, the flow boiling heat transfer characteristics from microporous surfaces in the minichannels have not been extensively studied, and the pertinent knowledge is rather fragmentary. The present research is an experimental investigation on flow boiling of a dielectric fluid FC-72 from microporous coating surfaces in horizontal, rectangular minichannels of 0.49, 0.93 and 1.26 mm hydraulic diameter. Effects of coating structural parameters, such as the particle diameter and coating thickness, were investigated to identify the optimum microporous coating for heat transfer enhancement. All microporous surfaces in this paper were found to significantly enhance FC-72 flow boiling heat transfer in minichannels. With the optimum coating, the heat transfer coefficients could be 7-10 times those of the uncoated surface, and the boiling wall temperature was reduced by about 10K. The flow boiling phenomena in the present minichannels were distinctly different from those in conventional-sized channels, due to the wall confinement effect on vapor bubbles. The confinement effect was evaluated by taking the contributions of the liquid mass flux and channel size into consideration. It was found that the very strong confinement effect was unfavorable with respect to flow boiling enhancement of the microporous coatings in the minichannels. (C) 2011 Elsevier Inc. All rights reserved.