Particle segregation mechanism of S–D system in a rotating drum--颗粒学报PARTICUOLOGY

Xiao, E., Zhang, W., Chi, Z., Li, R., & Yang, H. (2024). Particle segregation mechanism of S–D system in a rotating drum. Particuology, 93, 300-308. https://doi.org/10.1016/j.partic.2024.07.007

Particle segregation mechanism of S–D system in a rotating drum

Erliang Xiao^a, Wei Zhang^a, Zhipeng Chi^a, Ran Li^a, Hui Yang^{a b *}

a School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
b College of Medical Instrumentation, Shanghai University of Medicine & Health Sciences, Shanghai, 201318, China

10.1016/j.partic.2024.07.007

Volume 93, October 2024, Pages 300-308

Received 5 March 2024, Revised 18 June 2024, Accepted 9 July 2024, Available online 20 July 2024, Version of Record 29 July 2024.

E-mail: yangh_23@sumhs.edu.cn

Highlights

• A transition of segregation pattern in S–D system was achieved in circular drum.

• Effect of segregation mechanisms and particle diffusion in system were discussed.

• Buoyancy mechanism and particle diffusion mainly effected pattern transition.

• A dimensionless parameter was proposed to predict the segregation pattern.

Abstract

Complex segregation occurs in a binary particle system with differing particle sizes and densities, particularly when the larger particles are heavier (S–D system, i.e., size minus density system). Predicting the segregation pattern driven by multiple mechanisms simultaneously is often challenging. This study explores the segregation mechanisms in a quasi-2D circular drum containing a S–D system, realizing a transition between the S-core and Core-and-band patterns by adjusting the drum rotation speed. During the transition of the segregation pattern, only the S-core pattern chiefly driven by the percolation mechanism is initially observed. As the rotation speed increases, the buoyancy mechanism and particle diffusion gradually strengthen, jointly driving the formation of the Core-and-band pattern. A dimensionless strength ratio, λ = H/h, where H and h respectively represent the diffusion and buoyancy strengths at length scales, is introduced to elucidate this transition. The Core-and-band pattern emerges when λ reached 1.4.

Graphical abstract

Keywords

Particle segregation; S–D system; Segregation mechanisms competition; Segregation pattern; Rotating drum

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