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首页> 外文期刊>International Journal of Heat and Mass Transfer >Predictions of flow and heat transfer in multiple impinging jets with an elliptic-blending second-moment closure
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Predictions of flow and heat transfer in multiple impinging jets with an elliptic-blending second-moment closure

机译：带有椭圆混合第二矩闭合的多重撞击射流中的流动和传热预测

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摘要

We present numerical computations of flow and heat transfer in multiple jets impinging normally on a flat heated surface, obtained with a new second-moment turbulence closure combined with an elliptic blending model of non-viscous wall blocking effect. This model provides the mean velocity and turbulent stress fields in very good agreement with PIV measurements. The exploration of several simpler closures for the passive thermal field, conducted in parallel, confirmed that the major prerequisite for the accurate prediction of the temperature field and heat transfer is to compute accurately the velocity and stress fields. If this is achieved, the conventional anisotropic eddy-diffusivity model can suffice even in complex flows. We demonstrate this in multiple-impinging jets where such a model combination provided the distribution of Nusselt number over the solid plate in good agreement with experiments. Extension of the elliptic blending concept to full second-moment treatment of the heat flux and its truncation to a quasi-linear algebraic model is also briefly discussed.
机译：我们提出了一种新的第二矩湍流闭合与非粘性壁阻塞效应的椭圆混合模型相结合而获得的，通常撞击在平坦加热表面上的多股射流中的流动和传热的数值计算方法。该模型提供的平均速度和湍流应力场与PIV测量非常吻合。并行进行的对被动热场的几种简单闭合的探索，证实了准确预测温度场和传热的主要前提是精确计算速度场和应力场。如果做到这一点，即使在复杂的流动中，常规的各向异性涡-扩散率模型也足够了。我们在多冲击射流中证明了这一点，其中这种模型组合提供了与实验良好吻合的实心板上Nusselt数的分布。还简要讨论了将椭圆混合概念扩展到热通量的完整第二矩处理并将其截断为准线性代数模型的过程。

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