DU Tongjie^1a, ZHOU Liang², CHEN Lifan², WANG Hongjie², CHEN Quan^1b, KONG Ping²

(1a. School of Health Science and Engineering, 1b. School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology, Shanghai 200093, China;2. Collaborative Innovation Center, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China)

Abstract：In order to study the internal motion and structural changes of the particle system driven by external energy, the local probability density distribution and velocity distribution of spherical particles with an average diameter of 2 mm in the vertical vibrating two-dimensional disk were measured by local density judgment method and particle image velocimetry method, and the spatial distribution characteristics and kinetic characteristics of discrete particles during gas-liquid phase transition were explored. By increasing the filling density of particles in the disk and the acceleration of the shaker, the relationship model of the characteristic parameters K, mean density φ and acceleration Γ of the local probability density distribution was established. The results show that when the vertical vibrating particle system is in the gas state, the velocity distribution of particles in the particle system satisfies the exponential distribution, and the particle velocity distribution index is equal to 1.52. In the process of φ and Γ of the particle system, the critical condition of the gas-liquid phase transition of the particle system and the velocity distribution of the particle velocity during the gas-liquid phase transition is consistent, that is, when the particle velocity distribution index is equal to 1.40, the vertical vibrating particle system begins to transform from the gaseous state to the liquid state.

Keywords：vibrationally particle system; gas-liquid phase change; density distribution

Get Citation：DU T J, ZHOU L, CHEN L F, et al. Critical characteristics of gas-liquid phase transition in vertical vibrating particle systems[J]. China Powder Science and Technology, 2023, 29(5): 40-48.

DOI：10.13732/j.issn.1008-5548.2023.05.006

Received：2023-03-21,Revised：2023-05-30,Online：2023-07-26 17：52。

Funding Project：国家自然科学基金项目,编号:11902190。

First Author：杜童节(1998—),男,硕士研究生,研究方向为振动颗粒气体。E-mail: f203592629@163.com。

Corresponding Author：孔平(1979—),女,副教授,博士,硕士生导师,研究方向为智能信息处理。E-mail: kongp@sumhs.edu.cn。