中国物理B ›› 2024, Vol. 33 ›› Issue (2): 24501-024501.doi: 10.1088/1674-1056/ad117b

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

Ren Han(韩韧), Ting Li(李亭), Zhipeng Chi(迟志鹏), Hui Yang(杨晖), and Ran Li(李然)†   

  1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 收稿日期:2023-10-13 修回日期:2023-11-21 接受日期:2023-12-01 出版日期:2024-01-16 发布日期:2024-01-19
  • 通讯作者: Ran Li E-mail:ran89@usst.edu.cn
  • 基金资助:
    Project supported by the Qingdao National Laboratory for Marine Science and Technology (Grant No. 2015ASKJ01) and the National Natural Science Foundation of China (Grant Nos. 11972212, 12072200, and 12002213).

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

Ren Han(韩韧), Ting Li(李亭), Zhipeng Chi(迟志鹏), Hui Yang(杨晖), and Ran Li(李然)†   

  1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2023-10-13 Revised:2023-11-21 Accepted:2023-12-01 Online:2024-01-16 Published:2024-01-19
  • Contact: Ran Li E-mail:ran89@usst.edu.cn
  • Supported by:
    Project supported by the Qingdao National Laboratory for Marine Science and Technology (Grant No. 2015ASKJ01) and the National Natural Science Foundation of China (Grant Nos. 11972212, 12072200, and 12002213).

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摘要： 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 the 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 the 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 the T2 stage.

关键词: avalanche, initial state, polydisperse particle systems, propagation

Abstract: 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 the 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 the 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 the T2 stage.

Key words: avalanche, initial state, polydisperse particle systems, propagation

中图分类号:  (Avalanches)

  • 45.70.Ht
45.70.Mg (Granular flow: mixing, segregation and stratification) 45.70.-n (Granular systems)