相变微胶囊悬浮液在树形微通道内的热力特性

以乙二醇水溶液为载冷基液制备了相变微胶囊悬浮液（MEPCMS），并测量了其物性参数，然后实验研究了MEPCMS在树形微通道内的热力特性，揭示了雷诺数、质量分数对MEPCMS热力性能的影响规律。结果表明:MEPCMS的比定压热容随着微胶囊质量分数与温度的增加而增大，黏度随着微胶囊质量分数的增加与温度的降低而增大；MEPCMS的表面传热系数随着雷诺数与质量分数的增大而增大，当雷诺数为118时，质量分数为1%、3%的MEPCMS的表面传热系数相对于载冷基液分别提高了3.92%和9.04%；MEPCMS的摩擦因子随雷诺数的增大与质量分数的减小而减小，但随着雷诺数的增加，MEPCMS的摩擦因子逐渐接近载冷基液。 

Thermal performance of microencapsulated phase change material slurry in treelike microchannels

Micro-encapsulated phase change material slurry （MEPCMS） was prepared using glycol solution as cold-based solution，and its physical properties were measured.Then，the thermodynamic properties of MEPCMS in tree microchannels were experimentally studied to reveal the influence of Reynolds number and mass concentration on the thermodynamic properties of MEPCMS.The results showed that the specific heat capacity of MEPCMS increased with the increase of microcapsule mass concentration and temperature，and the viscosity of MEPCMS increased with the increase of microcapsule mass fraction and the decrease of temperature.The convective heat transfer coefficient of MEPCMS increased with Reynolds number and mass concentration.When Reynolds number was 118，the convective heat transfer coefficients of MEPCMS at 1% and 3% mass fraction increased by 3.92% and 9.04%，respectively，compared with the base solution.The friction factor of MEPCMS decreased with the increase of Reynolds number and the decrease of mass concentration，but the friction factor of MEPCMS gradually approached the base solution with the increase of Reynolds number.