狭缝射流冲击泡沫金属强化换热的数值模拟

The numerical simulation of forced convection in porous medium subject to impinging jet

为了分析泡沫金属在狭缝射流冲击泡沫金属强化换热的作用,在计算流体力学(CFD)的基础上,采用数值模拟的方法,对影响换热的一系列因素做了详细的研究。在模型中泡沫金属材质为纯铜,尺寸是定值,通过改变喷嘴内空气速度v、泡沫金属孔隙率φ、喷嘴宽度W与泡沫金属的高度H的比值、喷嘴到泡沫金属上表面的高度C与泡沫金属的高度H的比值,来分析各个因素对热表面换热系数、泡沫金属内温度分布和流线分布等因变量的影响。

To analyze the influence of the convective heat transfer in porous medium with a confined slot air jet, the series of factors affecting heat transfer were studied by numerical simulation in computational fluid dynamics （CFD）. The size of the cop- per metal foam was fixed. Through changing some parameters like the nozzle velocity （v）, porosity of the metal foal（ φ）, the ratio of the jet nozzle width to the metal foam height （W/H） and the ratio of the jet - to - foam tip distance to the metal foam height （ C/H）, the effects of the changing of the heat transfer coefficient on the heat surface, the temperature distribution in the metal foam and the flow distribution in the flow channel were discussed and quantitatively compared at different operating conditions.