泡沫铜内空气流动特性的研究

泡沫铜内流体动力学特性对其换热性能影响非常重要。为充分利用泡沫铜的换热性能,通过实验研究了泡沫铜的孔隙率、孔密度对空气流过泡沫铜的压降、渗透系数、惯性系数、雷诺数的影响,以及雷诺数和摩擦系数之间的关系。实验结果表明压降是随着泡沫铜的孔密度的增大而增大,随着孔隙率的增大而减小;渗透系数是随着泡沫铜的孔密度增大而减小,随着孔隙率增大而增大;惯性系数则是随着泡沫铜的孔密度增大而减小,孔隙率的变化对惯性系数则影响较小;而雷诺数约为15~20以下时,摩擦系数是随雷诺数增大而增大。

Research of the Air Flow Characteristics through Copper Foams

Fluid dynamics characteristics of flow through copper foam are very important to its heat transfer performance influence. In order to use the heat transfer performance of copper foam well, Effects of pore density and porosity of copper foam on air pressure drop, on the permeability and inertia coefficient, on the Reynolds number,and the Relationship between Reynolds number and friction factor for air flow though copper foam were studied. Experimental results show that the pressure drop through copper foam increases as pore density increases, but decreases as porosity increases; the permeability through copper foam decreases as pore density increases and increases as porosity increases; the inertia coefficient decreases with the pore density increasing, the change in porosity has little effect on the inertia coefficient; the friction factor increases as Reynolds number increases before 15 to 20.