相变微胶囊悬浮液管内层流强迫对流换热分析

Laminar Flow Forced Convection Heat Transfer of Microencapsulated Phase Change Material Slurry in Tube

为了从微观角度研究雷诺数对相变微胶囊悬浮液对流传热的影响,对恒热流边界条件下圆管内相变微胶囊悬浮液层流进行了数值模拟。结果表明,Re数对相变微胶囊悬浮液的对流换热效果的影响主要是通过相变区的位置和大小决定的。Re数越大,相变区越长,壁面温度越低,相应的修正对流换热系数和修正努塞尔数越大,对流换热效果越好。

In order to discover the impact of Reynolds numbers to convection heat transfer of MPCMs（Microencapsulated Phase Change Material slurries）,the laminar flow of MPCMs in circular tube at constant heat flux boundary condition is simulated numerically.The results show that the impact of Reynolds numbers to the convective heat transfer of MPCM slurries is mainly on the position and size of the phase change area.The larger Reynolds numbers is,the longer phase change area,and the lower wall temperature.As the result,the greater revised convective heat transfer coefficient is and the revised Nusselt number is,so the convective heat transfer is enhanced.