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为了解摩擦电选过程中摩擦器内颗粒的碰撞特性,采用标准k-ε湍流模型及颗粒轨道模型,以10和74μm球形颗粒为研究对象,对两种不同结构摩擦器内的颗粒运动速度和轨迹进行数值模拟.运用红外热像技术对摩擦器可视化模型的温度场分布进行了实验研究,结果表明,摩擦器内温度呈对称分布特征,颗粒高效碰撞区位于温度较高的摩擦棒间隙内;粒径和摩擦棒分布对颗粒碰撞的影响很大,相同粒径的颗粒在正三角分布摩擦器内碰撞效果优于正方形分布,相同结构的摩擦器内大颗粒的碰撞效果优于小颗粒.
In order to understand the collision characteristics of the particles in the frictional electrification process, the standard k-ε turbulence model and the particle orbit model were used to study the effects of the particle velocity The simulation results show that the temperature in the friction stirrer is symmetrical and the high efficiency collision zone is located in the gap of the friction rod with high temperature. The particle size and the distribution of the friction rod have a great influence on the particle collisions. The collisions of the particles with the same particle size in the equilateral triangle are superior to the square ones. The collisions of the large particles in the same structure are superior to those of the small particles.