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首页> 外文期刊>International Journal of Heat and Mass Transfer >Mixed convection flow in a vertical circular duct with time-periodix boundary conditions: steady-periodic regime
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Mixed convection flow in a vertical circular duct with time-periodix boundary conditions: steady-periodic regime

机译：具有时间周期边界条件的垂直圆形管道中的混合对流：稳态周期状态

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摘要

Mixed convection flow in a vertical circular duct subjected to a periodic sinusoidal temperature change at the wall is investigated. The analysis is performed by considering fully-developed parallel flow and steady-periodic regime. The local momentum and energy balance equations, together with the constraint equations which arise from the definition of mean velocity and mean temperature, are written in a dimensionless form and mapped into equations in the complex domain. One obtains two independent boundary value problems, which provide the mean value and the oscillating term of the velocity and temperature distributions. These boundary value problems are solved analytically, and the velocity and temperature distributions are obtained as functions of three parameters: the Prandtl number, Pr, the dimensionless frequency Ω, the ratio between the Grashof number Gr and the Reynolds number Re. The Fanning friction factor and the dimensionless heat flux are" evaluated.
机译：研究了壁上周期性正弦温度变化的垂直圆形管道中的混合对流。分析是通过考虑充分发展的平行流和稳态周期进行的。局部动量和能量平衡方程，以及由平均速度和平均温度定义产生的约束方程，以无量纲形式编写，并映射到复数域中的方程中。一个获得两个独立的边值问题，分别提供速度和温度分布的平均值和振荡项。通过分析解决了这些边界值问题，并根据三个参数获得了速度和温度分布：普朗特数Pr，无因次频率Ω，格拉斯霍夫数Gr与雷诺数Re的比值。评估了范宁摩擦系数和无因次热通量。

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