摘要：为实现均匀包覆, 对流化床包覆的流场及颗粒的团聚特性进行研究;基于CFD中的群体平衡模型对流化床内液滴的雾化行为进行二维数值模拟, 并与离散相模型的计算结果进行对比。结果表明, 群体平衡模型和离散相模型可得出相同的速度场分布, 群体平衡模型可进一步得出更为详细的粒径分布。群体平衡模型可作为离散相模型的替代模型进一步研究颗粒的聚并和破碎行为。

关键词：群体平衡模型；离散相模型；粒径分布；喷雾冷冻

Abstract：In order to realize the uniform coating, the flow field of spray freeze fluidized bed and the agglomeration characteristics of the particles need to be made a further investigation. The atomization behavior of droplets in the fluidized bed was simulated based on the population balance model (PBM) in CFD, and the results were compared with those of the discrete phase model (DPM) . The results show that PBM and DPM can be used to obtain the same velocity field distribution and PBM can be used to obtain a more detailed particle size distribution. Therefore, PBM can be used as an alternative model of DPM to further investigate the coalescence and fragmentation behavior of particles.

Keywords: population balance model；discrete phase model；particle size distribution；spray-freezing