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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of spacing on laminar natural convection flow and heat transfer from two spheres in vertical arrangement
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Effect of spacing on laminar natural convection flow and heat transfer from two spheres in vertical arrangement

机译：间距对垂直排列的两个球层流自然对流和传热的影响

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摘要

Laminar natural convection heat transfer from two vertically arranged spheres has been investigated numerically in air (Pr = 0.72) for large Rayleigh number (Ra = 10(5)). The effect of sphere spacing (S) on fluid flow and heat transfer is comprehensively analyzed within the ratio of spacing to radius (S/R) ranging from 4 to 48, i.e., 2 = S/D = 24. Extensive results are obtained for complete descriptions on natural convection of two-sphere system, such as the streamline patterns and isotherm contours, dimensionless velocities and temperature profiles, drag coefficient, local and average Nusselt numbers. Comparisons with the isothermal bisphere have also been reported with the previous studies. Due to the interaction of preheating effect and flow mixing, the lower sphere has a great influence on the fluid flow and heat transfer around the upper sphere with the change of spacing between the two spheres. The variation of dimensionless temperature with the dimensionless distance between the two spheres has been also concluded to explain the impact of preheating effect. Finally, correlations have been developed for accurate prediction of natural convection heat transfer for each single sphere and the whole two-sphere system, which can be applied to relevant engineering calculations, and provide values for academic research. (C) 2019 Elsevier Ltd. All rights reserved.
机译：对于较大的瑞利数（Ra = 10（5）），已经在空气中（Pr = 0.72）对来自两个垂直排列的球体的层流自然对流换热进行了数值研究。在间距与半径之比（S / R）范围为4至48（即2 <= S / D <= 24）的范围内，全面分析了球面间距（S）对流体流动和传热的影响。获得有关两球系统自然对流的完整描述的信息，例如流线型式和等温线轮廓，无量纲的速度和温度曲线，阻力系数，局部和平均努塞尔数。与等温双球的比较也已与以前的研究报告。由于预热效果和流混合的相互作用，下球随着两个球之间的间距的变化，对上球周围的流体流动和传热有很大的影响。还得出了无因次温度随两个球之间无因次距离的变化，以解释预热效应的影响。最后，已经开发了相关性，以准确预测每个单个球体和整个两个球体系统的自然对流传热，这些相关性可用于相关的工程计算，并为学术研究提供价值。 （C）2019 Elsevier Ltd.保留所有权利。

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