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首页> 外文期刊>Journal of Heat Transfer >Simple Models for Laminar Thermally Developing Slug Flow in Noncircular Ducts and Channels
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Simple Models for Laminar Thermally Developing Slug Flow in Noncircular Ducts and Channels

机译：非圆形管道和通道中层流热发展团状流的简单模型

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摘要

Solutions to the classical Graetz slug flow problem (uniform velocity distribution) in noncircular ducts are examined. These solutions have applications where a constant uniform velocity distribution exists across a channel or duct. These are most often realized in the laminar flow of low Prandtl number liquids, such as liquid metals, and low Reynolds number flows through porous media. Expressions are developed for a number of applications using the asymptotic correlation method of Churchill and Usagi. These expressions vary depending on the definition used for the dimensionless heat transfer coefficient, in the case of constant wall temperature boundary condition (T), and the dimensionless wall temperature for the constant flux boundary conditions (H) and (HI). Finally, simple expressions are developed for predicting the thermal entrance length and fully developed flow Nu values for noncircular ducts.
机译：研究了非圆形管道中经典Graetz弹头流动问题（均匀速度分布）的解决方案。这些解决方案具有在通道或导管上存在恒定均匀速度分布的应用。这些通常在低普朗特数液体（例如液态金属）的层流中实现，而低雷诺数流经多孔介质的则为层流。使用Churchill和Usagi的渐近相关方法，为许多应用开发了表达式。这些表达式根据在恒定壁温边界条件（T）的情况下用于无量纲传热系数的定义以及恒定通量边界条件（H）和（HI）的无量纲壁温而变化。最后，开发了简单的表达式来预测非圆形管道的热入口长度和充分发展的流量Nu值。

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