The behaviors of particle-wall collision for non-spherical particles: Modeling analysis

Abstract

The particle-wall collision behaviors are important to gas-solid separation, a common process in the energy and chemical industries. To model such collisions in simulations, the impulsive equations involving the restitution and friction coefficients are commonly used, with a virtual wall to address the abnormal rebound behaviors for grazing impacts. In the present work, this model was analyzed and compared with experimental data of spherical and non-spherical particles. The results show that a restitution coefficient distribution is necessary to accurate model predictions, because of stochastic energy loss for large impact angles. The updated model is feasible for particle-wall collisions of non-spherical particles, with relative velocity errors up to 15% within the experimental conditions. Non-spherical particles' fitted model parameters are featured with smaller restitution coefficients, larger variations of restitution coefficients, larger friction coefficients and larger deviations of wall inclination angles, as the energy loss increases while the rebounding becomes more stochastic.