多孔介质冰蓄冷板的融化过程

模拟研究了泡沫铝、泡沫铜、网状聚氨酯泡沫的孔隙参数对多孔介质冰蓄冷板的融化过程的影响,得到了第三类边界条件下多孔介质冰蓄冷板融化过程的时间、温度分布、相界面移动等的规律。结果表明,多孔介质热导率越高,温度分布越均匀,相界面越模糊,冰蓄冷板融化时间越短;融化时间随多孔介质孔隙率的减小和孔密度的减少而缩短,孔隙率的影响程度大于孔密度;与纯冰相比,本研究中泡沫铜最多可将冰蓄冷板融化时间缩短15.2%。多孔介质热导率越低,冰蓄冷板的融化时间越长;融化时间随着孔密度的增加而缩短,随孔隙率的减小而略增;与纯冰相比,本研究中网状聚氨酯泡沫最多可将冰蓄冷板释冷时间延长11.8%。最后对填充泡沫铜和网状聚氨酯泡沫冰蓄冷板的融化时间进行了试验验证,试验结果与模拟结果较为一致。

Melting process of porous-media-filled ice hold-over plate

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.