LI Lansheng¹, LI Ran¹, YANG Hui^1,2

(1. School of Optical-Electronical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Medical Instrumentation College, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China)

Abstract：The triggering and propagation mechanisms of discrete avalanche of granular matter in a rotating drum are complex, with the passive layer of particles playing a crucial role. In order to further investigate the triggering and propagation mechanisms of localized rearrangements of passive layer particles, discrete element simulations were conducted to study the discrete avalanche of particles in a rotating drum, and an improved granular temperature calculation method was used to obtain more detailed information about the motion of passive layer particles. First, the particle rearrangement was identified by the spatial distribution of the passive layer granular temperature, and the time and spatial distribution of the particle rearrangement region in the avalanche period were obtained. Then, the propagation speed of particle rearrangement, particle stacking structure, and mechanical properties were investigated in specific particle rearrangement regions. The results show that particle rearrangement is widespread in the entire passive layer during the avalanche period and occurred most frequently in the upper part of the passive layer. Particle rearrangement propagates in the form of elastic waves from the triggering point to the surroundings, with a faster propagation speed in the direction of the main force chain. The particle rearrangement area is further away from the Coulomb failure criterion after rearrangement, and the entire area experiences slight compaction.

Keywords：rotating drum; discrete element method; granular temperature; rearrangement

Get Citation：LI L S, LI R, YANG H. Passive layer particle rearrangement mechanism in discrete avalanche of rotating drum[J]. China Powder Science and Technology, 2023, 29(5): 49-60.