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首页> 外文期刊>Journal of Heat Transfer >Nusselt Number Correlations for Turbulent Natural Convection Flows Using Asymptotic Analysis of the Near-Wall Region
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Nusselt Number Correlations for Turbulent Natural Convection Flows Using Asymptotic Analysis of the Near-Wall Region

机译:利用近壁区域的渐近分析对湍流自然对流的Nusselt数相关

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摘要

In this paper, we propose a general methodology by which a universal temperature profile, derived by matching temperature gradients in the overlap region of the wall layer and the core layer, that is valid for high Rayleigh number flows, can be recast into a correlation for the Nusselt number. We then evaluate its adequacy for three types of flows: (a) fully developed flows (e.g., the infinite channel), (b) developing flows (e.g., the vertical flat plate boundary layer), and (c) complex flows (e.g., Rayleigh-Benard convection and the differentially heated square cavity). The correlation for the Nusselt number, in general, contains a logarithmic term, usually missing in earlier studies, with which we are able to match existing direct numerical simulations or experimental data very well for both fully developed and complex flows.
机译:在本文中,我们提出了一种通用方法,通过该方法,可以将壁层和芯层重叠区域中匹配的温度梯度匹配而得出的通用温度曲线(对于高瑞利数流有效)可以重塑为一个相关系数。 Nusselt号。然后,我们评估其对于三种类型的流的适当性:(a)充分展开的流(例如,无限通道),(b)展开的流(例如,垂直平板边界层),以及(c)复杂的流(例如, Rayleigh-Benard对流和差热方形腔)。通常,Nusselt数的相关性包含一个对数项,这在早期研究中通常会丢失,利用它我们可以很好地匹配现有的直接数值模拟或实验数据,以进行充分开发和复杂的流动。

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