Flow and thermal modeling of liquid metal in expanded microchannel heat sink

作     者：Mingkuan ZHANG Xudong ZHANG Luna GUO Xuan LI Wei RAO Mingkuan ZHANG;Xudong ZHANG;Luna GUO;Xuan LI;Wei RAO

作者机构：Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent ControlSchool of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering EducationTianjin University of TechnologyTianjin 300384China Key Laboratory for Thermal Science and Power Engineering of the Ministry of EducationDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China School of Mechanical EngineeringTianjin University of CommerceTianjin 300134China Institute of Refrigeration and CryogenicsShanghai Jiao Tong UniversityShanghai 200240China Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of CryogenicsBeijing 100190China 

出 版 物：《Frontiers in Energy》 (能源前沿（英文版）)

年 卷 期：2023年第17卷第6期

页      面：796-810页

核心收录：

学科分类：08[工学] 081201[工学-计算机系统结构] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Thanks to Jing LIU  Zhongshan DENG and Yixin ZHOU for their guidance and suggestions on this work 

主　　题：liquid metal cooling heat sink expanded microchannel flow and thermal modeling 

摘      要：Liquid metal-based microchannel heat sinks (MCHSs) suffer from the low heat capacity of coolant, resulting in an excessive temperature rise of coolant and heat sink when dealing with high-power heat dissipation. In this paper, it was found that expanded space at the top of fins could distribute the heat inside microchannels, reducing the temperature rise of coolant and heat sink. The orthogonal experiments revealed that expanding the top space of channels yielded similar temperature reductions to changing the channel width. The flow and thermal modeling of expanded microchannel heat sink (E-MCHS) were analyzed by both using the 3-dimensional (3D) numerical simulation and the 1-dimensional (1D) thermal resistance model. The fin efficiency of E-MCHS was derived to improve the accuracy of the 1D thermal resistance model. The heat conduction of liquid metal in Z direction and the heat convection between the top surface of fins and the liquid metal could reduce the total thermal resistance (Rt). The above process was effective for microchannels with low channel aspect ratio, low mean velocity (Um) or long heat sink length. The maximum thermal resistance reduction in the example of this paper reached 36.0%. The expanded space endowed the heat sink with lower pressure, which might further reduce the pumping power (P). This rule was feasible both when fins were truncated (h_(2) 0).