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A Simple, Effective Viscosity Formulation for Turbulent Flow and Heat Transfer in Compact Heat Exchangers

机译:一种用于紧凑型换热器中湍流和传热的简单有效的粘度公式

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摘要

A simple algebraic methodology for computing turbulent stresses and fluxes in arrays of heat exchanger elements is proposed. An effective Reynolds number is computed from the back-projection of the friction or heat transfer factor onto the low-Reynolds-number profile. This is then used to obtain the turbulent viscosity for fluid friction, or turbulent Prandtl number, for heat transfer. It is shown that under certain circumstances, the resulting mathematical expression is consistent with the Brinkman-Forchheimer modified form of Darcy's law and also with the Reynolds quadratic form for frictional/heat transfer resistance. The model is critically appraised in comparison to empirical data for compact and tube bank heat exchangers. The circumstances where it renders a good predictive measure are highlighted and discussed critically.
机译:提出了一种简单的代数方法,用于计算热交换器元件阵列中的湍流应力和通量。有效的雷诺数是根据摩擦系数或传热系数在低雷诺数轮廓上的反投影计算得出的。然后将其用于获得流体摩擦的湍流粘度或传热的湍流普朗特数。结果表明,在某些情况下,所得的数学表达式与达西定律的Brinkman-Forchheimer修正形式以及与摩擦/传热阻力有关的雷诺兹二次形式一致。与紧凑型和管束式换热器的经验数据相比,该模型得到了严格的评估。对其进行了很好的预测的情况将被重点讨论。

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