Eur. Phys. J. E (2022) 45: 54
https://doi.org/10.1140/epje/s10189-022-00207-0

Regular Article - Flowing Matter

Size segregation of disk particle in two-dimensional chute

¹ Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, China
² School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, China

^b pingwu@sas.ustb.edu.cn

Received: 7 January 2022
Accepted: 13 May 2022
Published online: 14 June 2022

Abstract

Size segregation will lead to stratification of a particle system. At present, people have not fully understood the segregation mechanism. In this work, we have studied the size segregation behavior of two-component disk particles in chute flows. The effects of particle size ratio η, particle density ρ, static friction coefficient μ and chute angle α on size segregation are discussed. We use the discrete element method to simulate and calculate the force of disk large particles during segregation. Results show that the ‘squeeze expulsion’ mechanism plays a key role in the size segregation of a disk particle flow. We establish a physical model of ‘squeeze expulsion’ of disk particles and obtain the conditions for the formation of ‘squeeze expulsion’ mechanism.