泡沫金属内空气流动换热特性数值研究

Numerical Study on Air Flow and Heat Transfer in Foam Metal

本文数值研究泡沫金属内空气的流动换热特性,利用Surface Evolver软件生成了孔隙率分别为0.926、0.957、0.980,孔密度分别为10、20、40的泡沫金属几何拓扑结构,在孔隙尺度上探讨了孔隙率、孔密度对泡沫金属内部流动换热特性的影响。结果表明,在孔隙率相同的情况下,换热系数和压降均随着孔密度的增加而增加;在孔密度相同的情况下,孔隙率对换热系数的影响较小但对压降的影响较大。

This paper numerically studies the air flow and heat transfer in foam metal.The geometric topological structures of foam metal with porosities of 0.926,0.957,0.980 and pore densities of 10,20,and 40 are created using the Surface Evolver software,and their effects on the flow and heat transfer are investigated on the pore scale.The results show that for a fixed porosity,the heat transfer coefficient and pressure drop increase with increasing pore density;for a fixed pore density,the porosity has a small influence on the heat transfer coefficient but a greater influence on the pressure drop.