Particle effects on the hydrodynamics in slurry bubble column reactors: A review from multiscale mechanisms--颗粒学报PARTICUOLOGY

An, M., Gao, J., Wang, T., & Li, X. (2024). Particle effects on the hydrodynamics in slurry bubble column reactors: A review from multiscale mechanisms. Particuology, 91, 176-189. https://doi.org/10.1016/j.partic.2024.02.009

Particle effects on the hydrodynamics in slurry bubble column reactors: A review from multiscale mechanisms

Min An^a *, Jingqi Gao^b, Tiankuo Wang^a, Xiangnan Li^c *

a National Supercomputing Center in Zhengzhou, Zhengzhou University, Zhengzhou, 450001, China
b School of Chemical Engineering and New Energy, Xiamen University Malaysia, Sepang, Selangor, 43900, Malaysia
c School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China

10.1016/j.partic.2024.02.009

Volume 91, August 2024, Pages 176-189

Received 2 December 2023, Revised 28 January 2024, Accepted 12 February 2024, Available online 19 March 2024, Version of Record 29 March 2024.

E-mail: anmin@zzu.edu.cn; xnli@htu.edu.cn

Highlights

• Mechanisms of particle effects on hydrodynamics at multi scales are reviewed.

• Dimensionless groups for charactering particle effects are raised and compared.

• Increased slurry viscosity is the dominant effect of the tiny porous particle only.

• Entrained particles have a pivoting effect on the turbulence energy spectrum.

Abstract

Particles can appear as catalyst, reactant or product in various gas-liquid-solid three-phase production processes. Slurry bubble column reactors (SBCRs), as a kind of three-phase reactors, are preferred for phase contacting and mixing. However, literature studies concerning the effects of particles on the hydrodynamics of SBCRs are manifold and inconsistent in conclusions. Essentially, the multiscale interactions between particles, turbulent eddies and bubbles determine the reactor performance. This review focuses on revealing the particle effects in SBCRs from the perspective of multiscale mechanisms. Macroscopic hydrodynamic changes due to particle effects in literature are summarized. Dimensionless parameters, including the Stokes number, the solid-to-liquid density ratio, the ratio of particle and liquid characteristic lengths, the contact angle and the particle volume fraction are adopted to evaluate the characteristics of gas-liquid-solid flows. The relationships between particle influencing mechanisms and these parameters are analyzed and determined. Inconsistent experimental results are explained by different ranges of these dimensionless parameters. Moreover, particle effects at the mesoscale and microscale, such as the influence on the bubble dynamics and the pivoting effect on the turbulence energy spectrum, are elaborated. Finally, progress in modeling the SBCRs with consideration of particles effects using the Euler method are introduced. This review aims to improve the overall understanding of the complex hydrodynamics in the SBCRs.

Graphical abstract

Keywords

Slurry bubble column reactors; Particle effects; Turbulence characteristics; Bubble dynamics; CFD

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