The collision behaviors of non-spherical regular particle-wall in three-dimensional space: Experimental investigation

Abstract

The edges and corners of non-spherical particles cause random bounces in three-dimensional space after the particle-wall collision. To study the collision behaviors, four kinds of non-spherical regular particles are prepared, and the collision test system with a dual-camera is built. The collision process is characterized by introducing the lateral velocity and lateral angle. The rebound angle, lateral angle, and recovery coefficients under different particle diameters and impact angles are obtained. The results show that the rebound angle, lateral angle, and recovery coefficients of non-spherical regular particles are highly dispersed. The mean rebound angles of non-spherical regular particles are significantly smaller than that of spherical particles. The particle diameter, impact angle, and recovery coefficients are in negative correlation. The normal recovery coefficients of non-spherical particles are greatly reduced, and the tangential recovery coefficients change slightly. The recovery coefficients can be applied to multi-phase flow simulations to improve the simulation accuracy.