Abstract

The present article describes a numerical study conducted to investigate particle movement inside a rotating drum under different operating conditions. The discrete element method (DEM) was used in order to describe granular flow dynamics. The effects of the main operating conditions (i.e., rotating speed and fill level) on the dynamic angle of repose were studied. It was found that the dynamic angle of repose increased by increasing the rotating speed and fill level. The results showed that by increasing the rotation speed, fraction of particles in the active area increased. While, by increasing the fill level, fraction of particles in the active area decreased. Also, granular temperature of the solid bed was calculated in order to characterize the velocity fluctuation of particles in the rotating bed. It was found that the granular temperature increased by increasing the rotating speed. Furthermore, the effect of the friction coefficient on the dynamics of granular particles was investigated. When the particle-particle and particle-wall friction coefficients are increased, the dynamic angle of repose is slightly increased. Also, the results showed that granular temperature increased as the friction coefficient decreased.

摘要

本文描述了一项数值研究，用于研究不同操作条件下转鼓内的颗粒运动。离散元法（DEM）用于描述颗粒流动动力学。研究了主要操作条件（即转速和填充水平）对动态休止角的影响。发现动态休止角随着旋转速度和填充水平的增加而增加。结果表明，随着旋转速度的增加，活性区域中的颗粒分数增加。同时，通过增加填充水平，活性区域中的颗粒比例减少。此外，还计算了固体床的颗粒温度，以表征旋转床中颗粒的速度波动。发现颗粒温度随着转速的增加而升高。此外，研究了摩擦系数对颗粒动力学的影响。当颗粒-颗粒和颗粒-壁摩擦系数增加时，动态休止角略有增加。此外，结果表明颗粒温度随着摩擦系数的降低而升高。