Based on turbulent diffusion theory and the mechanism of liquid-gas interfacial mass transfer, a conceptual model of turbulent re-aeration process is proposed.
本文根据紊动扩散理论及气液界面质量传递过程，提出了紊动水体复氧过程的概化模型。
So the turbulent diffusivity in gradient transfer model of scalar should be a second order tensor.
因此，在用梯度准则模拟湍流输运时，其输运系数应是一个二阶张量。
The calculation results of the model show that the addition of solid particles makes the fluid turbulent flow enhance, the heat transfer enhance and the wall temperature decrease.
由模型计算结果可知，固体颗粒的加入使流体的湍流程度增强，强化了传热，降低了壁温。
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