(火积)耗散极值原理和基于(火积)理论的热阻最小原理在传热过程优化中有着广泛应用,但在多种传热方式耦合传热过程中的应用尚未见报道.本文针对一典型的辐射对流耦合传热问题,定义了耦合传热过程的总(火积)耗散率和总热阻,并用数值方法验证了在给定总发射率、辐射热端温度、冷却流体温度和对流换热系数的前提下,当(火积)耗散率取极大值和热阻取极小值时,对应着用最小的辐射换热温差获得最大的换热热流,从而说明了(火积)耗散极值原理和热阻最小原理在该耦合传热过程分析与优化中的适用性,而此时熵产最小原理并不适用.
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