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用一组封闭的迟豫方程来计算湍流应力τT 和湍流热流密度 qT,从而建立起湍流迁移模型 ,此模型与大量实验结果相吻合 ,具有普适性。采用此湍流迁移模型对圆管内变物性流体在减速流时并考虑非定常流的影响 ,对热交换过程进行数值模拟研究。与实验相比较 ,得到较一致的结果。表明 :同时考虑变物性和非定常性的影响 ,使得数值模拟和实验的比较具有实际意义
A closed set of delay equations are used to calculate the turbulent flow stress τT and the turbulent heat flux qT to establish a turbulent migration model. This model is consistent with a large number of experimental results and is universal. Using this turbulent model, the numerical simulation of the heat exchange process is carried out for the influence of unsteady flow on variable flow in a circular tube. Compared with the experiment, get more consistent results. It shows that considering the influence of variable property and unsteady property makes the comparison between numerical simulation and experiment have practical significance