该模型假设颗粒在分级轮中具有二力平衡状态，即颗粒的运动状态主要取决于流体黏滞力与离心力的作用.音画同步的《空军一号》
The particle movement in the radial direction is assumed resulting from local equilibrium of two forces , the air drag force and the centrifugal force .
音画同步