Heat Transfer Performance of a Novel Microchannel Embedded with Connected Grooves

作     者：Ding Yuan Wei Zhou Ting Fu Qingyu Dong Ding Yuan;Wei Zhou;Ting Fu;Qingyu Dong

作者机构：Department of Mechanical and Electrical EngineeringXiamen UniversityXiamen361005China Key Laboratory of Metallurgical Equipment and Control TechnologyWuhan University of Science and TechnologyWuhan430081China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2021年第34卷第6期

页      面：362-372页

核心收录：

学科分类：080701[工学-工程热物理] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 

基　　金：Supported by the Natural Science Foundation of China(Grant No.51922092) Natural Science Foundation of Fujian Province of China(Grant No.2017J06015) the Equipment Pre-research Foundation of China(Grant No.61409230206) Open Fund of the Key Laboratory for Metallurgical Equipment and Control of Ministry of Education in Wuhan University of Science and Technology(Grant No.MECOF2019A01). 

主　　题：Microchannel Connected grooves Heat transfer enhancement Performance evaluation 

摘      要：To improve the heat transfer performance of microchannels,a novel microchannel embedded with connected grooves crossing two sidewalls and the bottom surface(type A)was designed.A comparative study of heat transfer was conducted regarding the performances of type A microchannels,microchannels embedded with grooves on their bottom(including types B and C),or on the sidewalls(type D)as well as smooth rectangular microchannels(type E)via a three-dimensional numerical simulation and experimental validation(at Reynolds numbers from 118 to 430).Numerical results suggested that the average Nusselt number of types A,B,C,and D microchannels were 106,73.4,50.1,and 12.6%higher than that of type E microchannel,respectively.The smallest synergy angle β and entropy generation number Ns,a were determined for type A microchannels based on field synergy and nondimensional entropy analysis,which indicated that type A exhibited the best heat transfer performance.Numerical flow analysis indicated that connected grooves induced fluid to flow along two different temperature gradients,which contributed to enhanced heat transfer performance.