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首页> 外文期刊>International Journal of Heat and Mass Transfer >On The Effects Of Rayleigh Number And Inlet Turbulence Intensityrnupon The Buoyancy-induced Mass Flow Rate In Slopingrnand Convergent Channels
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On The Effects Of Rayleigh Number And Inlet Turbulence Intensityrnupon The Buoyancy-induced Mass Flow Rate In Slopingrnand Convergent Channels

机译：瑞利数和入口湍流强度对倾斜和会聚通道浮力引起的质量流率的影响

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摘要

A numerical study on the mass flow rate induced by natural convection in a sloped converging channel for different inclination and convergence angles with symmetrical heating is reported. Two-dimensional, laminar, transitional and turbulent simulations were obtained by solving the fully-elliptic governing equations using two different general purpose codes: Fluent and Phoenics. In transitional and turbulent cases, the low-Reynolds k-ω turbulence model was employed. Special emphasis was carried out, for turbulent regime, on the systematic comparisons of computational results with experimental and numerical data taken from literature, considering the influence of inlet turbulence intensity upon transitional point. Numerical results were obtained for wide and not yet covered ranges of the modified Rayleigh number varying from 10~(-2) to 10~(12), the aspect ratio between 0.03 and 0.25, the converging angle from 1° to 30° and sloping angle from 0° to 60°. A generalized correlation for the non-dimensional mass flow rate in a channel with isothermal plates and symmetric heating conditions is presented.
机译：报道了在倾斜加热通道中自然对流在对称加热条件下不同倾角和会聚角引起的质量流率的数值研究。通过使用两种不同的通用代码（Fluent和Phoenics）求解全椭圆控制方程，可以获得二维，层流，过渡和湍流模拟。在过渡和湍流情况下，采用低雷诺兹k-ω湍流模型。考虑到入口湍流强度对过渡点的影响，对于湍流状态，特别强调了将计算结果与来自文献的实验数据和数值数据进行系统比较。修正瑞利数范围从10〜（-2）到10〜（12），宽高比在0.03和0.25之间，会聚角在1°到30°之间以及倾斜角度从0°到60°。提出了具有等温板和对称加热条件的通道中无量纲质量流率的广义相关性。

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