泡沫材料冰蓄冷板融化过程的研究

建立了填充泡沫材料冰蓄冷板内冰融化过程的数学物理模型,该模型考虑了融化液态水自然对流的影响。分别数值模拟了填充开孔聚氨酯泡沫、泡沫铜的冰蓄冷板的融化过程,研究了泡沫材料冰蓄冷板融化过程的速率、温度分布、相界面移动等规律。进行了实验对比,验证分析了泡沫材料的孔隙参数对融化速率的影响。结果表明,填充低导热系数泡沫材料可有效延长冰蓄冷板的释冷时间,该时间随泡沫孔密度的减小而增加、随孔隙率的增大而略减。填充高导热系数泡沫材料可有效改善冰蓄冷板温度分布,可加快冰融化速率,该速率随着泡沫孔隙率的减少而增加、随孔密度的减少而略增。

Investigation on Melting Process of Ice Cold-plate with Porous Material

A physical and mathematical model to describe the melting process in foam-filled ice cold-plate was developed. The natural convection of liquid water was taken into account. The melting processes of ice cold-plates filled with open-cell polyurethane foams and copper foams were simulated. The principles of the melting rates, temperature distributions, interface movements were analyzed. Comparisons were made between the model predictions and experimental data. The influences of foams pore parameters to ice melting rates were confirmed. The results indicate that foams with low thermal conductivity efficiently extends the melting time. The time increases obviously with the decrease of pore density and increases slowly with the increase of porosity. In contrast, the foams with high thermal conductivity effectively improve the temperature distribution and accelerate the melting rate. The rate increases obviously with the decrease of porosity and increases slightly with the decrease of pore density.