Transition from random packing to stable state in a continuously avalanching granular flow

Han, Ren; Wang, Zhi; Chen, Quan; Yang, Hui; Li, Ran

doi:10.1016/j.apt.2022.103872

Cited by 1 publication

(2 citation statements)

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“…[3,4] Various factors such as coordination number, velocity, and volume fraction have been examined in existing works. [5,6] In the monodisperse collapse system, the transition process from the initial state to the steady state has been studied. [6] One finding is noted that in the initial state the volume fractions of the passive layer at different depths are distinct, and local volume fractions are also various.…”

Section: Introductionmentioning

confidence: 99%

“…[5,6] In the monodisperse collapse system, the transition process from the initial state to the steady state has been studied. [6] One finding is noted that in the initial state the volume fractions of the passive layer at different depths are distinct, and local volume fractions are also various. Examining the characteristics of nucleation points and propagation velocity in a monodisperse particle system, Han et al [7] found that the probability of nucleation points appearing at any point on the surface of the drum is the same.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation for the initial state of avalanche in polydisperse particle systems

Han 韩,

Li 李,

Chi 迟

et al. 2024

Chinese Phys. B

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In this paper, numerical simulation is employed to investigate the initial state of avalanche in polydisperse particle systems. Nucleation and propagation processes are illustrated for pentadisperse and triadisperse particle systems, respectively. In these processes, particles involved in the avalanche grow slowly in the early stage and explosively in the later stage, which is clearly different from the continuous and steady growth trend in monodisperse system. By examining the avalanche propagation, the number growth of particles involved in the avalanche and the slope of the number growth, the initial state can be divided into three stages: T1(nucleation stage), T2 (propagation stage), T3(overall avalanche stage). We focus on the characteristics of the avalanche in T2 stage, and find that propagation distances increase almost linearly in both axial and radial directions in polydisperse systems. We also consider the distribution characteristics of the average coordination number and average velocity for the moving particles. The results support that the polydisperse particle systems are more stable in T2 stage.

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