Mixing equipments are widely used in many industry processes. Solid-liquid suspension is one of the most important processes in stirred operations. For the fluid flow in solid-liquid stirred tank, it is important to study velocity distributions for both solid and liquid in the tank, and then to investigate the influence of particle concentration on liquid velocity distribution. The new method of using Computational Fluid Dynamics (CFD) for the study of flow and mixing characteristics in stirred tank is adop...