Research on the parameter calibration and the interaction mechanisms of irregular wet particles

To increase the accuracy of simulation parameters for wet irregular particles and investigate the interaction mechanisms between wet particles, the parameters for three types of irregular wet particles are calibrated and validated. Firstly, the models for the three types of wet irregular particles are constructed, and the corresponding stacking angles are obtained. Then, the linear regression equation between the significant parameters and the particle stacking angle is established to validate the relative errors. The results showed that the relative errors for the simulated and experimental stacking angles of the capsule, cassia seed, and colored sand particles are 1.83 %, 1.51 %, and 2.23 %, respectively. These relative errors are lower than those reported in existing literature. Moreover, particle fluidity tests are conducted to explore the particle interaction mechanisms. The results indicate that the smooth and hydrophilic particle surfaces are more likely to accumulate water molecules and form liquid bridges, which lead to enhanced adhesion and decreased particle fluidity. On the contrary, the liquid bridge is more prone to fracture on a rough and hydrophobic particle surface, which leads to decreased adhesion and enhanced particle fluidity. The study demonstrates that this parameter calibration method and the interaction mechanisms of wet irregular particles are reliable.