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Volume 103
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Kang, Y., Zhang, W., Zhang, Y., Li, J., & Chen, Z. (2025). A numerical study on the mixing behavior of spherical and non-spherical particles in a spouted fluidized bed. Particuology, 103, 88-103. https://doi.org/10.1016/j.partic.2025.05.004
A numerical study on the mixing behavior of spherical and non-spherical particles in a spouted fluidized bed
Yu Kang a, Wei Zhang a b *, Yuming Zhang a b *, Jiazhou Li a b, Zhewen Chen a b
a College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing, 102249, China
b State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing, 102249, China
10.1016/j.partic.2025.05.004
Volume 103, August 2025, Pages 88-103
Received 18 December 2024, Revised 12 April 2025, Accepted 7 May 2025, Available online 17 May 2025, Version of Record 3 June 2025.
E-mail: zhang.wei@cup.edu.cn; ymzhang@cup.edu.cn
Highlights

• Binary mixing behavior of cylindrical and spherical particles is first investigated at particle scale.

• Mixing index is significantly influenced by aspect ratio and mass fraction of cylindrical particles.

• Variation in pitch angle of cylindrical particles primarily depends on their aspect ratio.


Abstract

Biomass energy is considered a promising renewable energy resource to cope with global carbon neutrality goals and the ongoing energy crisis. However, the irregular shapes and varying sizes of milled biomass particles hinder their effective usage in biomass reactors for energy generation. Previous research on non-spherical particles has mainly focused on single-particle systems, with limited studies on binary mixtures. This study employs CFD-DEM method with superquadric shape representation to investigate the mixing behavior of spherical and cylindrical particles in a spouted fluidized bed. The results show that increasing the aspect ratio of cylindrical particles increases accumulation in dead zones. A higher proportion of cylindrical particles significantly reduces spouting height and makes the V-shaped dead zone more evidence. During spouting from a static state, cylindrical particles exhibit notable changes in pitch angle, transitioning from horizontal to vertical orientations, with these trends becoming more pronounced at higher aspect ratios. These findings provide insight into the mixing behavior of binary particle system of spherical and non-spherical particles, and offer a guidance for the reactor operation with these particle types.

Graphical abstract
Keywords
Non-spherical particles; Binary mixture; CFD-DEM; Spouted fluidized bed; Pitch angle
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