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应用(火积)耗散极值原理和构形理论,对强迫对流换热冷却的产热体进行构形优化设计,得到了基于(火积)耗散率最小的最优管间距和最优管道直径.结果表明,基于(火积)耗散率最小与最大温差最小的最优构形明显不同.对于前者,换热通道的体(火积)在整个产热体中最优占比为1/2;而对于后者,该占比越大越好.与后者的最优构形相比,前者的最优构形极大地降低了产热体的当量热阻,明显改善了产热体的整体传热性能.基于(火积)耗散极值原理时,传递相同热量(给定发热体的发热量)所需的传热温差是最小的,符合(火积)耗散极值原理的本质要求.
By applying the principle of exergy dissipation and the theory of configuration, the configuration optimization design of heat transfer body under forced convection cooling is obtained, and the optimal tube spacing based on the minimum heat flux dissipation ratio is obtained. The results show that the optimal configuration based on the minimum (fire product) dissipation rate and the minimum temperature difference is significantly different. For the former, the optimal heat transfer volume fraction 1/2, while for the latter, the bigger the proportion is, the better the latter’s optimal configuration, the former’s optimal configuration greatly reduces the equivalent thermal resistance of the heat generating body and obviously improves the heat generating body The heat transfer temperature difference required to deliver the same amount of heat (the calorific value of a given heating element) is minimal based on the exergy principle of (fire product), which corresponds to the principle of (exergy) dissipation extremum The essential requirements.