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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of thermal buoyancy on flow and heat transfer around a permeable circular cylinder with internal heat generation
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Effect of thermal buoyancy on flow and heat transfer around a permeable circular cylinder with internal heat generation

机译：热浮力对内部产生热量的可渗透圆柱体周围流动和传热的影响

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Mixed convection heat transfer around a permeable circular cylinder with internal heat generation in steady flow was numerically investigated by applying the finite volume method for the coupled porous and pure fluid regions with collocated body-fitted and multi-block grids. Particular emphasis is given to the dual role of thermal buoyancy in flow pattern and heat transfer performance with regard to effects of the Reynolds number (Re), Darcy number (Da), and Richardson number (Ri). Details of flow and thermal characteristics are presented in terms of streamlines, isotherms, velocity distribution, wake length, drag coefficients, and Nusselt number around a permeable cylinder. Thermal buoyancy is found to have positive or negative impact on flow and heat transfer, depending on the orientation of the interaction between buoyancy force and incoming flow. Aiding buoyancy delays or completely suppresses the onset of the recirculating wake and enhances heat transfer, while opposing buoyancy has the opposite effect. For all cases studied here, heat transfer rate from a porous cylinder is higher than that from a solid one. Results also show that drag coefficients decrease with Re for the aiding buoyancy case, while present complex development for the opposing buoyancy case. All drag coefficients and average Nusselt number (Nu(ave)) with opposing buoyancy are smaller than those with aiding buoyancy. Also, for a high Ri = 1, inverse flow appears at the rear of the cylinder due to the prominent influence of opposing buoyancy. (C) 2018 Elsevier Ltd. All rights reserved.
机译：通过有限体积法对带有贴体和多块网格并置的多孔和纯流体耦合区域进行了有限体积法，数值研究了具有稳定内部热量产生的可渗透圆柱周围的混合对流传热。关于雷诺数（Re），达西数（Da）和理查森数（Ri）的影响，特别强调了热浮力在流型和传热性能中的双重作用。根据流线，等温线，速度分布，尾流长度，阻力系数和可渗透圆柱体周围的Nusselt数，提供了流量和热特性的详细信息。发现热浮力对流动和传热有正面或负面影响，这取决于浮力和进入的流动之间相互作用的方向。辅助浮力可延迟或完全抑制再循环尾流的发生并增强热传递，而相反的浮力则具有相反的作用。对于本文研究的所有情况，多孔圆柱体的传热速率均高于固态圆柱体的传热速率。结果还表明，在辅助浮力情况下，阻力系数随Re减小，而在相反浮力情况下，阻力系数呈现复杂的发展趋势。具有相对浮力的所有阻力系数和平均努塞尔特数（Nu（ave））小于具有辅助浮力的所有系数。同样，对于高Ri> = 1，由于反向浮力的显着影响，逆流出现在圆柱体的后部。 （C）2018 Elsevier Ltd.保留所有权利。

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