泡沫金属矩形通道中对流换热的实验和模拟

Experimental and Numerical Simulation of the Convective Heat Transfer in a Metal-foam Filled Rectangular Channel

实验研究和数值模拟了泡沫金属三维矩形通道内的流动和传热,引入基于渗透率的雷诺数和达西数,确定了泡沫金属对流换热和流动阻力的准则关系式,并分析了多孔结构参数和气体流速对对流换热系数、阻力系数的影响。研究结果表明:泡沫金属对流换热模拟结果与实验数据趋于一致,互为验证了可靠性;泡沫金属的换热强度和流动阻力均随孔径的减小(孔密度的增大或孔隙率的减小)而增大,大孔径的泡沫金属具有较好的对流换热综合性能;气体流速的增加有利于强化换热。

Convective heat transfer in metal-foam filled three-dimensional rectangular channels was experimentally and numerically studied. Non-dimensional Darcy and Reynolds number based on the permeability were introduced. And the empirical equations describing convective heat transfer in foam-filled channel were finally obtained. The effects of pore structural parameter and fluid velocity on the convection heat transfer coefficient and drag codfficient were further analyzed. Numerical results are in good coincidence with the experimental data, so experimental and numerical studies are proven to he reliable. It turns out that, convective heat transfer of forced flow in the channel is enhanced with smaller pore size （i.e. higher pore-distribution density or lower porosity） of metal foams, but at the expense of higher pressure drop. Metal foams with larger pore size have better overall performance on convective heat transfer. Furthermore, increasing fluid velocity enhances convective heat transfer in channels.