Analysis of microstructure of particle dispersed fluid by particle simulation method

摘要

A particle simulation method (PSM) is proposed for computing the dynamics of particle dispersed systems. In this method, a particle is modeled by using arrays of spheres. Two adjacent spheres are connected with three types of springs; stretch,bend, and twist for the deformability of the particle. The motion of the particles in flow is followed by solving the translational and rotational equations of motion for each constituent sphere. The hydrodynamic interaction among particles is consideredby decomposing into intra and inter-fiber ones. In the former, the many-body problem is solved by calculating the mobility matrix for each particle to obtain the hydrodynamic force and torque exerted on each sphere. In the latter, only the near-fieldlubrication force is treated between spheres of a given particle and another. The method was applied to predicting the microstructure of fiber and plate-like particle dispersed systems, their rheological properties, and the motion of fillers in aninjection molding flow.