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发汗冷却多孔区域的非热平衡模型数值计算中,冷端边界条件对多孔介质内流固温度分布有着非常明显的影响。该文针对发汗冷却多孔壁面内部非热平衡模型理论求解方法中冷端边界条件的设置问题,比较了3种不同的冷端边界条件设置模型。结果表明:在流动Reynolds数较小时,假设冷端流体温度等于初始温度的等温边界且假设边界绝热的边界条件会导致冷端附近流固温度偏低;而假设等温边界同时存在冲击冷却边界会使得流固温度整体范围内偏低。该文分析了量纲为1的数对不同边界条件模型计算结果的影响,指出量纲为1的冷却剂流量与多孔体Biot数增加会使流体冷端进口温度等于远端温度假设成立,并提出了热平衡假设成立的条件方程。
In the numerical calculation of the non-thermal equilibrium model of sweat cooling porous region, the cold boundary conditions have a very significant effect on the fluid temperature distribution in porous media. In this paper, the problem of setting the cold boundary conditions in the theoretical solution of the nonthermal equilibrium model of the porous wall with sweat cooling is compared. Three different cold junction boundary condition setting models are compared. The results show that when the Reynolds number is small, assuming that the temperature of the cold end fluid is equal to the isothermal boundary of the initial temperature and the boundary conditions of the boundary are assumed to be adiabatic, the fluid solid temperature will be low near the cold end. Fluid solid temperature overall low range. In this paper, the influence of the number of one on the calculation results of different boundary conditions is analyzed. It is pointed out that the increase of the coolant flow rate with the Biot number of the porous body will make the inlet temperature of the cold end equal to the remote temperature assuming A conditional equation for the assumption of heat balance is proposed.