Hi'/> Numerical analysis of forced convection of high-temperature exhaust gas around a metal-foam wrapped cylinder
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Numerical analysis of forced convection of high-temperature exhaust gas around a metal-foam wrapped cylinder

机译：金属泡沫包裹气缸周围高温废气强制对流的数值分析

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Highlights•Establish a model of forced convection around a metal-foam wrapped cylinder.•Brinkman-Darcy-Forchheimer momentum equation and LTNE energy equation are employed.•Cross flow and heat transfer performance of high-temperature exhaust are examined.•A conclusion of heat transfer and pressure drop is obtained.AbstractDue to its high volumetric porosity and large specific surface area, open-cell metal foam has considerable advantages in compact heat exchangers for waste heat recovery system of internal combustion engines (ICEs). In order to simulate the forced convection around a metal foam-wrapped tube, a precise macroscopic model using the Darcy-Forchheimer-Brinkman momentum equation and the local thermal non-equilibrium energy equation has been established, and the heat transfer and pressure drop performance are investigated. Effects of key parameters, including porosity, pore density, foam thickness and Reynolds number are numerically studied and analyzed. It is found that the presence of a foam layer around the cylinder changes the flow structure, especially in the rear of the cylinder, and then influences the heat transfer and pressure field. A comparative study has been conducted between foam cylinders and a bare tube for various Reynolds number. The results indicate that, compared to a bare cylinder, the average Nusselt number of metal-foam wrapped cylinders can improve as much as 10 times atRe=1000and 18 times approximately atRe=6000, which shows significant improvement in heat transfer performance.
机译： 突出显示 • 建立围绕金属泡沫包裹的圆柱体的强制对流模型。 • Brinkman-Darcy-Forchheimer动量方程和LTNE能量 • 检查了高温废气的横流和传热性能。 • 传热和压降的结论 摘要 由于其高的孔隙率和大的比表面积，开孔金属泡沫在用于内燃机余热回收系统的紧凑型热交换器中具有相当大的优势（ICE）。为了模拟金属泡沫包裹管周围的强制对流，建立了使用达西-福希海默-布林克曼动量方程和局部热非平衡能方程的精确宏观模型，并且传热和压降性能为调查。数值研究和分析了关键参数的影响，包括孔隙率，孔隙密度，泡沫厚度和雷诺数。发现在圆柱体周围存在泡沫层会改变流动结构，尤其是在圆柱体的后部，从而影响传热和压力场。对于各种雷诺数，已经在泡沫缸和裸管之间进行了比较研究。结果表明，与裸露的圆柱相比，金属泡沫包裹的圆柱的平均Nusselt数量在 Re = 1000 和18倍于 Re = 6000 ，显示出传热性能的显着改善。

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