相变胶囊悬浮液射流冲击泡沫金属的水热分析

Thermohydraulic analysis of MPCM slurry jet impinging on the metal foam

本文研究了多孔泡沫金属覆盖底部受热面在相变微胶囊(MPCM)悬浮液射流冲击下的强化传热。通过数值模拟的方法,运用Forchheimer-Brinkman-Darcy关系式和局部热平衡方程描述泡沫金属内冷却剂的流动。与实验进行了模型对照,证实了泡沫金属和相变微胶囊悬浮液强化换热的特性,讨论了喷嘴尺寸、泡沫金属孔隙率和高度、相变微胶囊悬浮液质量分数的影响。结果表明利用相变微胶囊悬浮液和泡沫金属耦合作用在射流冲击中可以获得较低的壁面温度。当入口速度v_(in)=1 m/s,孔隙率ε=0.85,冷却剂质量分数c_(m)=5%时,散热器的冷却效果最佳。

The enhanced heat transfer of the bottom heating surface covered by porous metal foam under the impact of microencapsulated phase change material(MPCM)slurry jet impingement was studied.Through numerical simulation,the Forchheimer-Brinkman-Darcy relationship and local heat balance equation were used to describe the flow of coolant in metal foam.The characteristics of heat transfer enhancement of metal foam and MPCM slurry were confirmed by comparing the model with the experiment.The effects of nozzle size,porosity and height of metal foam,and mass fraction of MPCM slurry were discussed.The results show that the lower wall temperature can be obtained by using the coupling effect of MPCM slurry and metal foam in jet impingement.The cooling effect of the heat sink is the best with the inlet velocity v_(in)=1 m/s,porosity ε=0.85,mass fraction of coolant c_(m)=5%.