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

ISSN号：0577-6686
期刊名称：《机械工程学报》
时间：0
分类：TN05[电子电信—物理电子学] TK123[动力工程及工程热物理—工程热物理;动力工程及工程热物理—热能工程]
作者机构：[1]College of Naval Architecture and Power, Naval University of Engineering, Wuhan 430033, China
相关基金：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）

作者： XIAO QingHua CHEN LinGen SUN FengRui[1]

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, entransy dissipation extremum principle, constructal theory, forced convection, entransy dissipation rate, generalizedthermodynamic optimization

中文摘要：

产生强迫的传送对流凉下来的体积的热的几何学被使用 entransy 驱散极值原则和 constructal 理论优化，当在邻近的试管和每个试管的最佳的直径之间的最佳的间距基于 entransy 驱散率最小化被获得时。这个工作的结果证明分别地，最佳的构造清楚地基于 entransy 驱散率最小化和最大的温度差别最小化是不同的。为前者，分配到产生体积的热的隧道的体积的孔是 1/2；当时为后者，孔越大，表演将是越多更好。前者的最佳的构造极大地减少吝啬的热抵抗并且与后者的最佳的构造相比改进系统的全球热转移表演。这与要求的热转移温度差别基于 entransy 驱散极值原则与一样的热转移率(在产生体积的热产生的热的给定的数量) 是最小的 entransy 驱散极值原则的必要要求相同。

英文摘要：

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.