个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:Nottingham trent University
学位:博士
所在单位:能源与动力学院
学科:制冷及低温工程. 工程热物理. 热能工程
办公地点:能动学院新大楼822室
联系方式:wzhongli@dlut.edu.cn
电子邮箱:wzhongli@dlut.edu.cn
A numerical study on heat transfer performance of microchannels with different surface microstructures
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论文类型:期刊论文
发表时间:2011-04-01
发表刊物:APPLIED THERMAL ENGINEERING
收录刊物:Scopus、SCIE、EI
卷号:31
期号:5,SI
页面范围:921-931
ISSN号:1359-4311
关键字:Microchannel; Heat transfer; Numerical simulation; CFD; LBM
摘要:Forced convection heat transfer occurring in microchannel is numerically studied in this paper using the CFD (computational fluid dynamics) and LB (lattice Botlzmann) approaches. Simulation results of these two methods are compared and tested against available experimental correlation, and a good agreement is achieved. It suggests that both methods are suitable to describe the liquid flow in microchannels. The influence of microchannel geometric shape on heat transfer performance is investigated by evaluating fluid thermophysical parameter and Nusselt number of the high-temperature surface. It is found that the inflow liquid temperature raises intensively along the flow direction at the entry region, and it develops gradually into equilibrium stage approaching the exit for each microstructure studied in this study. The heat exchange efficiency increases with inlet Reynolds number. The results also imply that the shield-shaped groove microchannel possesses the highest heat exchange performance. Compared with the lowest heat transfer efficiency of the plain surface structure, the averaged Nusselt number can be increased by about 1.3 times. Through the field synergy principle analysis, we find that it is the synergy between temperature gradient and velocity that results in different heat transfer performance for different microstructures. (C) 2010 Elsevier Ltd. All rights reserved.