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首页> 外文期刊>Journal of Heat Transfer >Forced and Free Flow in a Vertical Annular Duct Under Nonaxisymmetric Conditions
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Forced and Free Flow in a Vertical Annular Duct Under Nonaxisymmetric Conditions

机译：非轴对称条件下垂直环形管道中的强迫和自由流动

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摘要

The combined forced and free flow in a vertical annular duct is studied under the hypothesis of steady-state parallel laminar flow. The Boussinesq approximation is invoked and the viscous dissipation is considered as negligible. The thermal boundary conditions are such that axial symmetry does not occur and temperature does not change in the axial direction. The dimensionless local balance equations are solved analytically by means of the Fourier series expansion method. The analytical expressions of the dimensionless temperature field, of the dimensionless velocity field, and of the Fanning friction factor are obtained.
机译：在稳态平行层流的假设下，研究了垂直环形管道中的强迫和自由流动相结合。调用Boussinesq逼近，并将粘性耗散视为可忽略不计。热边界条件使得不会发生轴向对称并且温度不会在轴向方向上变化。无量纲的局部平衡方程通过傅立叶级数展开法解析求解。得到了无量纲温度场，无量纲速度场和范宁摩擦系数的解析表达式。

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