铝泡沫和石墨泡沫强化石蜡相变传热的数值模拟

Numerical Simulation of Heat Transfer Enhancement of Paraffin Wax Phase Change with Mmetal Foam and Graphite Foam

针对有机相变材料石蜡导热系数低的问题,通过添加多孔介质的方法以强化石蜡相变传热,并运用CFD软件对石蜡相变传热系统进行二维数值模拟.模拟结果表明:铝泡沫和石墨泡沫都能有效提高相变材料传热速率,铝泡沫的强化传热效果明显高于石墨泡沫的传热效果.随着孔隙率减小,多孔介质/石蜡复合材料的有效导热系数增大,传热速率加快,凝固需要的时间缩短.并且,孔隙率越小,经过相同凝固时间,装置内对应点温度越低.

Aiming at the problem of low conductivity of organic phase change material, two-dimensional numerical simulation on heat transfer enhancement of phase change of paraffin wax by adding porous media was conducted with the CFD software. The results showed that both Al foam and graphite foam could improve heat transfer rate effectively,and the effect of heat transfer of Al foam is superior to that of graphite foam, and the effective thermal conductivity of porosity/ paraffin wax composite materials is greater, heat transfer rate is faster;the solidification time shorten. And the temperature of corresponding points in device is lower after the same solidfication time with the decrease of porosity.