Constructal entransy dissipation rate minimization for a heat generating volume cooled by forced convection  

作　　者：XIAO QingHua CHEN LinGen SUN FengRui 

机构地区：[1]College of Naval Architecture and Power, Naval University of Engineering, Wuhan 430033, China

出　　处：《Chinese Science Bulletin》2011年第27期2966-2973,共8页

基　　金：supported by the National Natural Science Foundation of China (10905093);the Program for New Century Excellent Talents in University of China (NCET-04-1006);the Foundation for Authors of National Excellent Doctoral Dissertations of China (200136)

摘　　要：The geometry of a heat generating volume cooled by forced convection is optimized by applying the entransy dissipation extremum principle and constructal theory, while the optimal spacing between the adjacent tubes and the optimal diameter of each tube are obtained based on entransy dissipation rate minimization. The results of this work show that the optimal constructs based on entransy dissipation rate minimization and maximum temperature difference minimization, respectively, are clearly different. For the former, the porosity of the volume of channels allocated to the heat generating volume is 1/2; while for the latter, the larger the porosity is, the better the performance will be. The optimal construct of the former greatly decreases the mean thermal resistance and improves the global heat transfer performance of the system compared with the optimal construct of the latter. This is identical to the essential requirement of the entransy dissipation extremum principle that the required heat transfer temperature difference is minimal with the same heat transfer rate (the given amount of heat generated in the heat generating volume) based on the entransy dissipation extremum principle.The geometry of a heat generating volume cooled by forced convection is optimized by applying the entransy dissipation extremum principle and constructal theory, while the optimal spacing between the adjacent tubes and the optimal diameter of each tube are obtained based on entransy dissipation rate minimization. The results of this work show that the optimal constructs based on entransy dissipation rate minimization and maximum temperature difference minimization, respectively, are clearly different. For the former, the porosity of the volume of channels allocated to the heat generating volume is 1/2; while for the latter, the larger the porosity is, the better the performance will be. The optimal construct of the former greatly decreases the mean thermal resistance and improves the global heat transfer performance of the system compared with the optimal construct of the latter. This is identical to the essential requirement of the entransy dissipation extremum principle that the required heat transfer temperature difference is minimal with the same heat transfer rate （the given amount of heat generated in the heat generating volume） based on the entransy dissipation extremum principle.

关 键 词：对流冷却 构形理论 耗散率 最小化 发电量 极值原理 结构优化 传输性能 

分 类 号：TM611[电气工程—电力系统及自动化]