Modelling of electrostatic adsorption with polarization effects for sliding particles

Adsorption occurs when charged particles slide on a grounded metal chute, driven by electrostatic force. Electrostatic adsorption can cause the sliding speed of particles to slow down or even lead to blockage. This study enhances the point charge model by accounting for polarization-induced electrostatic effects, improving the accuracy of discrete element simulations for the electrostatic force of cluster particles. The multiple relationships between the polarization effect model and the point charge model are examined under varying relative permittivity, surface charge densities, and particle sizes. The polarization effect model yields a stronger electrostatic attractive force. The inclination angle calculated using the polarization effect model has an error of only 4.9% compared with the inclination angle experimental results, which is smaller than 24.4% of the point charge model. Furthermore, the polarization effect model successfully simulates the adsorption of charged particles onto uncharged particles and onto small like charged particles. Discrete element simulation results indicate that, during sliding, the polarization effect model results in greater electrostatic adsorption of particles onto the metal chute. This helps guide the process conditions through discrete element simulation to prevent the occurrence of blockage caused by the electrostatic adsorption of particles.