关键词: 多孔介质, 冰蓄冷板, 数值模拟, 孔隙参数, 相变

Abstract: The influences of porous aluminum foams, porous copper foams and reticulated polyurethane foams pore parameters on the melting processes of porous-material-filled ice hold-over plates were researched, from which the rules of melting rates, temperature distributions and movements of phase interface at the third boundary conditions were obtained. The results indicate that the higher thermal conductivity of porous material is, the better temperature distribution, the vaguer surface interface and the faster melting rate of ice hold-over plate there will be. The melting rate of ice hold-over plate increases with the decrease of porosity or pore density, and porosity has a larger influence than pore density. Compared with pure ice, the melting time of the copper-foams-filled ice hold-over plate can be shortened by 15.2% at maximum. On the contrary, the lower thermal conductivity of porous material is, the longer melting time of ice hold-over plate there will be. The melting time decreases with the increase of pore density or porosity. Compared with pure ice, the melting time of the reticulated-polyurethane-foams-filled ice hold-over plates can be increased by 11.8% at most. The melting times of porous-copper-filled and reticulated-polyurethane-foams-filled ice hold-over plates were also experimentally investigated and the results show accordance with the simulation results.

Key words: porous media, ice hold-over plate, numerical simulation, pore parameters, phase change