电沉积金属泡沫内的渗透流动特性

To explore the affecting mechanism of permeation characteristics of electrodeposited metal foam, experimental study was conducted for different foam structures and foam materials. Based on the fat pentagon-frame dodecahedron pore model, a semi-empirical permeation model of metal foam was developed. The variation of flow resistance in metal foam was analyzed, and the permeation characteristics of fluid in metal foam with different pore densities and porosities were obtained. The results show that the flow pattern of penetration is Darcy flow at small velocity, which is dominated by viscous effect, and the flow pattern is Forhheimer flow at large velocity, which is dominated by inertial effect. The constant term in the friction factor correlation of electrodeposited metal foam was 0.099 5, much larger than that of the constant of powder sintered metal foam. The modified model of hydraulic diameter was proposed with a maximum ±5% deviation. A new Darcy-Forhheimer correlation of differential pressure per unit length was proposed with a maximum ±15% deviation, and the permeability K and inertial coefficient F were predicted via porosity and hydraulic diameter to reflect the flow mechanism in metal foam.