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Fluid flow and forced convection heat transfer around a solid cylinder wrapped with a porous ring

机译:绕有多孔环的实心圆柱体周围的流体流动和强制对流换热

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Convective heat transfer from cylinders embedded in porous media is important for many engineering applications. In the present study, flow-field and heat transfer around a cylinder embedded in a layer of homogenous porous media is investigated numerically. The range of Reynolds and Darcy numbers are chosen to be 1-40 and 1 × 10~(-8)-1 × 10~(-1) respectively. Volume averaged equations are used for modeling transport phenomena within the porous layer and conservation laws of mass, momentum, an energy are applied in the clear region. A comprehensive parametric study is carried out and effects of several parameters, such as porous layer thickness and permeability as well as the Darcy and Reynolds numbers on flow-field and heat transfer characteristics are studied. Finally an optimization process is conducted in order to determine the optimal thickness and porosity of the porous layer resulting in the lowest heat transfer from the cylinder. The numerical results indicate that, in the presence of a porous layer around the cylinder, the wake length increases with decreasing the Darcy number while the critical radius of insulation increases.
机译:来自嵌入多孔介质的圆柱体的对流传热对于许多工程应用而言很重要。在本研究中,数值研究了嵌入在均匀多孔介质层中的圆柱体周围的流场和传热。雷诺数和达西数的范围分别选择为1-40和1×10〜(-8)-1×10〜(-1)。体积平均方程用于对多孔层内的传输现象进行建模,质量,动量和能量的守恒定律应用于透明区域。进行了全面的参数研究,研究了多孔层厚度和渗透率以及达西和雷诺数对流场和传热特性等多个参数的影响。最后,进行优化过程以确定多孔层的最佳厚度和孔隙率,从而使从圆柱体传出的热量最少。数值结果表明,在圆柱体周围存在多孔层的情况下,尾流长度随达西数的减小而增加,而绝缘的临界半径则增大。

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