Natural Convection Over a Rotating Cylindrical Heat Source in a Rectangular Enclosure
Natural Convection Over a Rotating Cylindrical Heat Source in a Rectangular Enclosure
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DOI：
10.1080/10407789408956018
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发表时间：
1994-12
影响因子：
2
通讯作者：
N. Ghaddar;F. Thiele
中科院分区：
文献类型：
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作者：
N. Ghaddar;F. Thiele
采用谱元法对一个绕其中心旋转且置于等温矩形腔内的均匀受热水平圆柱的层流二维自然对流换热进行了数值研究。针对圆柱在低转速和高转速下从纯自然对流到混合对流的广泛范围，研究了流动的物理特性及其热行为。该计算机程序已通过与现有关于腔内受热体纯自然对流的实验关联式进行了验证。研究发现圆柱的旋转可增强换热。在瑞利数与旋转雷诺数平方的比值（Ra/Reω²）较低时，圆柱表面的最高温度相较于固定圆柱的类似情况降低了多达25 - 35%。在Ra/Reω²适中时，圆柱上方上升的热羽流沿旋转方向偏移，且角偏移随着Ra/Reω²的增加而减小……
A numerical study of laminar two-dimensional natural convection heat transfer from a uniformly heated horizontal cylinder rotating about its center, and placed in an isothermal rectangular enclosure, is performed using a spectral element method. The physical aspects of the flow and its thermal behavior are studied for a wide range of pure natural convection to mixed convection at low and high rotational speeds of the cylinder. The computer program has been validated against experimental correlations available on pure natural convection of heated bodies in enclosures. The rotation of the cylinder has been found to enhance the heat transfer. At low ratios of Rayleigh number to the square of the rotational Reynolds number, Ra / Reω 2, the maximum temperature on the cylinder surface is decreased by as much as 25–35% from similar cases with fixed cylinders. At moderate values of Ra/ Reω 2, the thermal plume rising above the cylinder is shifted in the rotation direction and the angular shift decreases as Ra / R...