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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。
Experimental research and numerical simulation of the flow and heat transfer in the three-dimensional rectangular channel of metal foam are carried out. The Reynolds number and Darcy number based on permeability are introduced to determine the criterion of convection heat transfer and flow resistance of foam metal. The porous structure parameters And the effect of gas velocity on convective heat transfer coefficient and drag coefficient. The results show that the simulation results of convective heat transfer of foam metal tend to be in agreement with the experimental data, verifying the reliability of each other. The heat transfer strength and flow resistance of foam metal decrease with the decrease of pore diameter (pore density or porosity Decrease), and the large-aperture foam metal has better performance of convective heat transfer; the increase of gas flow rate is conducive to enhanced heat transfer.