Equivalent thermal resistance minimization for a circular disc heat sink with reverting microchannels based on constructal theory and entransy theory

作     者：WANG Liang XIE ZhiHui CHEN LinGen WANG Rong FENG HuiJun WANG Liang;XIE ZhiHui;CHEN LinGen;WANG Rong;FENG HuiJun

作者机构：College of Power EngineeringNaval University of EngineeringWuhan 430033China Institute of Thermal Science and Power EngineeringWuhan Institute of TechnologyWuhan 430205China School of Mechanical&Electrical EngineeringWuhan Institute of TechnologyWuhan 430205China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2021年第64卷第1期

页      面：111-121页

核心收录：

学科分类：0810[工学-信息与通信工程] 080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51979278 51579244 and 51506220) 

主　　题：constructal theory entransy dissipation extremum principle microchannel heat sink electronics cooling generalized thermodynamic optimization 

摘      要：Thermal designs for microchannel heat sinks with laminar flow are conducted numerically by combining constructal theory and entransy theory. Three types of 3-D circular disc heat sink models, i.e. without collection microchannels, with center collection microchannels, and with edge collection microchannels, are established respectively. Compared with the entransy equivalent thermal resistances of circular disc heat sink without collection microchannels and circular disc heat sink with edge collection microchannels, that of circular disc heat sink with center collection microchannels is the minimum, so the overall heat transfer performance of circular disc heat sink with center collection microchannels has obvious advantages. Furthermore, the effects of microchannel branch number on maximum thermal resistance and entransy equivalent thermal resistance of circular disc heat sink with center collection microchannels are investigated under different mass flow rates and heat fluxes. With the mass flow rate increasing, both the maximum thermal resistances and the entransy equivalent thermal resistances of heat sinks with respective fixed microchannel branch number all gradually decrease. With the heat flux increasing, the maximum thermal resistances and the entransy equivalent thermal resistances of heat sinks with respective fixed microchannel branch number remain almost unchanged. With the same mass flow rate and heat flux, the larger the microchannel branch number, the smaller the maximum thermal resistance. While the optimal microchannel branch number corresponding to minimum entransy equivalent thermal resistance is 6.