Structural relaxation and avalanche dynamics of particle piles under vertical vibration--颗粒学报PARTICUOLOGY

Zhu, L., Lu, H., Guo, X., & Liu, H. (2022). Structural relaxation and avalanche dynamics of particle piles under vertical vibration. Particuology, 68, 65-74. https://doi.org/10.1016/j.partic.2021.11.002

Structural relaxation and avalanche dynamics of particle piles under vertical vibration

Lizhuo Zhu, Haifeng Lu ^*, Xiaolei Guo, Haifeng Liu ^*

Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China

10.1016/j.partic.2021.11.002

Volume 68, September 2022, Pages 65-74

Received 3 August 2021, Revised 4 October 2021, Accepted 3 November 2021, Available online 18 November 2021, Version of Record 7 December 2021.

E-mail: luhf@ecust.edu.cn; hfliu@ecust.edu.cn

Highlights

• Effect of vibration conditions on avalanche of particle pile was studied.

• Six structural relaxation modes of different particles were obtained.

• Avalanche rate of particle pile height obeys exponential decay function.

• Analogy powder surface tension was introduced to analyze particle flowability.

Abstract

Granular matter can exhibit solid or liquid behavior, which contains complex physical mechanisms. In this work, we experimentally investigated the structural relaxation and avalanche dynamics of particle piles under vertical vibration. The influence of vibration parameters on the avalanche process was studied. The morphological features of avalanches were recorded and classified using high-speed camera. The effects of vibration parameters and particle properties on the relaxation mode are obtained. It is found that the evolution of particle pile height with time can be described by an exponential decay function. The relaxation rate and avalanche characteristics of four types of particles with different sizes are discussed. At the same acceleration level, for two larger particles, a smaller amplitude (A = 0.025 mm) leads to a faster relaxation rate, while for two smaller particles, a large amplitude (A = 0.500 mm) leads to a faster relaxation rate. The analogy powder surface tension is introduced to address the cohesion and flowability evolution of particles under vibration.

Graphical abstract

Keywords

Particle pile; Vertical vibration; Avalanche; Flowability

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