The studies on motion and collision of particle in rotating flow field are of great importance for chemical engineering. As the lack of work concerning the single particle, the motion trajectory and collision characteristics of single particle have not been understood. In this article, a coupled discrete element method (DEM) and the computational fluid dynamics (CFD) method model of a single particle in rotating flow field has been developed and verified by experimental data to investigate the collision characteristics of the particle. The effects of rotation speed and particle diameter on particle motion have been investigated by experiment. In The numerical simulation, the particle motion process has been simulated. The effects of particle density and liquid viscosity on collision and particle collision force have been investigated. Furthermore, the effects of wall and rotating fluid on particle rotation have been discussed and analyzed. The results indicate that the rotation speed of flow field and single particle diameter play significant roles in the particle motion behaviors. In the process of particle motion, the particle has collided with the wall at the bottom of the Y-axis of the trajectory. The selection of an appropriate particle material density and Liquid medium is beneficial for the decreasing of the number of collisions in a fully filled rotating flow field. The plastic deformation of wall will not be caused by collision force. In addition, the particle rotation is significant affected by the particle-wall contact, while it is hardly affected by rotating fluid. They thereby can provide a technical basis for prediction and control of particle motion and maintenance of equipment in centrifugal separation and helical transportation.

粒子在旋转流场中的运动和碰撞的研究对化学工程具有重要意义。由于缺乏有关单个粒子的工作，因此尚未了解单个粒子的运动轨迹和碰撞特性。本文建立了耦合离散元方法（DEM）和旋转流场中单个颗粒的计算流体力学（CFD）方法模型，并通过实验数据进行了验证，以研究颗粒的碰撞特性。通过实验研究了转速和粒径对粒子运动的影响。在数值模拟中，已经模拟了粒子运动过程。研究了颗粒密度和液体粘度对碰撞和颗粒碰撞力的影响。此外，讨论并分析了壁和旋转流体对粒子旋转的影响。结果表明，流场的旋转速度和单个粒径在颗粒运动行为中起着重要作用。在粒子运动的过程中，粒子已与轨迹的Y轴底部的壁碰撞。选择合适的颗粒材料密度和液体介质有利于减少完全填充的旋转流场中的碰撞次数。壁的塑性变形不会由碰撞力引起。另外，粒子旋转受粒子-壁接触的影响很大，而几乎不受旋转流体的影响。