Thermal or cold storage is a promising way to alleviate the peak-valley difference of the electricity load and improve the energy efficiency. The thermal or cold storage by micro-encapsulated phase change material (MPCM) slurry is one of the effective measures to be implemented in waste heat recovery and heat transport system etc. due to its high energy storage density and excellent heat transfer performance. The thermo-fluidic performances of the MPCM slurry flowing through the horizontally circular pipe under constant heat flux are numerically investigated based on the Eulerian-Eulerian approach in the present study. It is found that the numerical results are in good consistence with the experimental results from the aspects of flow and heat transfer. The influences of particle diameter on solid volume fraction distribution, solid velocity distribution and pressure drop of the MPCM slurry are investigated under isothermal condition. And then the temperature distribution of the MPCM slurry and liquid volume fraction of the PCM in MPCM are presented to analyze the heat transfer performance of the MPCM slurry. The particle diameter also imposes significant influences on the heat transfer between the two phases and average heat transfer coefficient of the MPCM slurry. The largest pressure drop and the highest average heat transfer coefficient appear when the particle diameter of the MPCM decreases to 1 μm. Further investigations at different Reynolds numbers are carried out to study the variation of local heat transfer coefficient along the pipe. Finally, the comparison of energy transport performances between the MPCM slurry and water are presented based on the ratio of transported heat to pumping power. The MPCM slurry shows better energy transport performance than pure water when the Reynolds number is above 7865.

蓄热或冷藏是减轻电力负荷的峰谷差异和提高能源效率的一种有前途的方法。微胶囊相变材料（MPCM）浆料的热或冷存储由于其高的能量存储密度和优异的热传递性能而成为在废热回收和热传输系统等中实施的有效措施之一。本文基于欧拉-欧拉方法，对在恒定热通量下流经水平圆形管道的MPCM浆料的热流性能进行了数值研究。从流动和传热两个方面发现数值结果与实验结果吻合良好。粒径对固体体积分数分布的影响，研究了等温条件下MPCM浆液的固相速度分布和压降。然后给出了MPCM浆液的温度分布和MPCM中PCM的液体体积分数，以分析MPCM浆液的传热性能。粒径还对两相之间的传热和MPCM浆料的平均传热系数产生重大影响。当MPCM的粒径减小到1μm时，出现最大的压降和最高的平均传热系数。在不同的雷诺数下进行了进一步的研究，以研究沿管道的局部传热系数的变化。最后，基于传热与泵送功率之比，对MPCM浆液和水之间的能量传输性能进行了比较。当雷诺数高于7865时，MPCM浆料显示出比纯水更好的能量传输性能。