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首页> 外文期刊>International Journal of Heat and Mass Transfer >The computed characteristics of turbulent flow and convection in concentric circular annuli. Part III. Alternative thermal boundary conditions
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The computed characteristics of turbulent flow and convection in concentric circular annuli. Part III. Alternative thermal boundary conditions

机译：同心圆环中湍流和对流的计算特征。第三部分替代热边界条件

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Numerically predicted values of the Nusselt number are presented for annuli with uniform heating of the outer surface only, uniform equal heating of both surfaces, and uniform heating of one surface and equal cooling of the other. Results are also presented for a parallel-plate channel with isothermal heating of one wall and equal isothermal heating of both walls. The predictions are based on semi-theoretical expressions for the dimensionless turbulent shear stress but are insensitive to the limited empiricism within the model for convection. The predicted values of Nu are in good agreement with the somewhat limited experimental data for these less frequently encountered thermal boundary conditions. The results encompass all values of the Prandtl number and all values of the Reynolds number of practical concern. These values, together with those in a preceding paper for uniform heating of the inner wall only, and together with the generalizations described in a succeeding paper, permit the accurate prediction of the Nusselt number from theoretically based algebraic expressions for essentially all of the thermal conditions that result in fully developed convection.
机译：给出了仅在均匀加热外表面，均匀加热两个表面以及均匀加热一个表面和均匀冷却另一个表面的情况下，环的Nusselt数值预测值。还给出了平行板通道的结果，其中一个壁的等温加热和两个壁的等温加热相等。这些预测基于无量纲湍流剪应力的半理论表达式，但对对流模型内的有限经验主义不敏感。对于这些不太频繁遇到的热边界条件，Nu的预测值与有限的实验数据非常吻合。结果包括实际关注的所有Prandtl值和所有Reynolds值。这些值以及仅用于均匀加热内壁的先前论文中的值，以及后续论文中描述的概括，均允许从理论上基本针对所有热条件的代数表达式精确预测Nusselt数导致对流充分发展。

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