泡沫金属内相变材料融化传热过程的数值模拟

NUMERICAL SIMULATION OF PHASE CHANGE MATERIAL THAWING PROCESS IN METALLIC FOAMS

以泡沫金属为基体,孔隙中填充相变材料能有效改善相变传热性能。考虑金属骨架与流体之间的不同的传热特性,建立了泡沫金属内融化相变传热的双温度模型。运用显热容法模拟了泡沫铝内融化相变的温度分布与流场。计算结果显示对比纯相变材料,加入泡沫铝能显著强化传热性能。固体骨架与储能材料之间在其相变时有较大的温差。

The phase change heat transfer can be effectively improved by using metallic foams filled with phase change materials. A two temperature model was established because of the difference of the heat transfer between the phase change material and the metallic matrix. Apparent heat capacity method was used to simulate the temperature distributions and flow fields of the phase change materials. The results showed that the heat transfer of the phase change materials with metallic foams was greatly enhanced compared with that of phase change materials without metallic foams. It was also showed that there are big temperature differences between the metallic matrix and phase change materials in the thawing phase change process.