with the theory of the diffusion-limited colloidal aggregation model ( dlca ), the processes of particles aggregation and breaking of the clusters are simulated . the fractal theory is applied to analysis of the aggregation structure of nanoparticles 在dcla生长模型的基础上,模拟了纳米粒子的聚集过程和大粒子团的分裂,并用分形理论对纳米流体的聚集结构进行了描述。