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首页> 外文期刊>International Journal of Heat and Mass Transfer >Natural convection in a square enclosure with a circular cylinder at different horizontal and diagonal locations
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Natural convection in a square enclosure with a circular cylinder at different horizontal and diagonal locations

机译：方形外壳中自然对流，圆柱形外壳在水平和对角线不同

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摘要

Numerical calculations are carried out for natural convection induced by a temperature difference between a cold outer square cylinder and a hot inner circular cylinder. The immersed-boundary method (IBM) to model the inner circular cylinder based on the finite volume method is used to study a two-dimensional natural convection for different Rayleigh umbers varying in the range of 10~3-10~6. The location of the inner circular cylinder is changed horizontally along the centerline of square enclosure or diagonally along a diagonal line of the square enclosure. We investigate both effects of the inner cylinder location in an enclosure and the buoyancy-induced convection on heat transfer and fluid flow. The existence of local peaks of the Nusselt number along the surfaces of the cylinder and the enclosure is determined by the gap and the thermal plume governed by the conduction and the convection, respectively. Detailed analysis results for the distribution of streamlines, isotherms and Nusselt number are presented in this paper.
机译：对于由冷的外部方圆柱体和热的内部圆柱体之间的温差引起的自然对流进行了数值计算。基于有限体积法对内圆柱进行建模的沉浸边界方法（IBM）用于研究瑞利数在10〜3-10〜6之间变化的二维自然对流。内圆柱的位置沿方形外壳的中心线水平变化，或沿方形外壳的对角线水平变化。我们研究了内部圆柱体在封闭空间中的位置以及浮力对流对热传递和流体流动的影响。沿着圆柱体和外壳表面的努塞尔数局部峰值的存在分别由间隙和热羽决定，该间隙和热羽分别由传导和对流控制。本文给出了流线，等温线和努塞尔数分布的详细分析结果。

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