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通过建立T型管道混合过程的流动与传热模型,选取RNG k–ε湍流模型封闭雷诺时均方程组,对冷热流体混合过程进行模拟,捕捉混合过程中速度和温度信息,将计算的流体速度和温度的时均值与试验值进行分析比较,结果吻合良好,得出RNG k??模型结合传热模型是模拟T型管道中冷热流体水力特性和传热机理的有效方法。通过比较上游进口段分别为直管和弯管时2种T型管内不同特征垂线的速度和温度分布,得出上游进口段为弯管时更有利于T型管道中冷热流体的混合,减小温度梯度,进而减小波动,对安全有利。
The model of RNG k-ε turbulence model was closed by establishing the flow and heat transfer model of the T-pipe mixing process, the mixing process of the cooling fluid and the cooling fluid was simulated to capture the velocity and temperature information in the mixing process, and the calculated fluid The results show that the RNG k model combined with the heat transfer model is an effective method to simulate the hydraulic characteristics and heat transfer mechanism of the hot and cold fluid in the T-pipe. By comparing the velocity and temperature distribution of the vertical plumbing and the plumbing, the vertical and the vertical distributions of the plumbing of different characteristics in the two kinds of T-tube are obtained. It is concluded that the mixing of the hot and cold fluid in the T- Reduce the temperature gradient, and then reduce the volatility, safe and beneficial.