为深入了解颗粒团聚体的分散机理及其动态细节,在经典离散元理论模型中引入范德华力和流体拖曳力,开发了三维颗粒离散元程序DEMix3D,对具有分形结构的颗粒团聚体在纯剪切流场中的分散过程进行数值模拟。结果表明:团聚体在流场中先发生变形然后再分散,分散过程中存在剥蚀和破碎两种分散方式;相同剪切流场下,初始团聚体的分形维数越小其分散效率越高。 In order to further understand the dispersion mechanism and dynamic details of the aggregates, Van der Waal’s force and fluid drag force are introduced into the classical discrete element theory model. DEMix3D, a three-dimensional particle discrete element program, is developed. The particle aggregates with fractal structure, The process of dispersion in the flow field is numerically simulated. The results show that the aggregates in the flow field firstly deform and then disperse. There are two kinds of dispersion modes of denudation and fragmentation in the flow field. Under the same shear flow field, the smaller the fractal dimension of the initial aggregates, the higher the dispersion efficiency.