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Which impeller should be chosen for efficientsolid–liquid mixing in the laminar and transitional regime?

Bastien Delacroix, Louis Fradette, François Bertrand, Bruno Blais

Article (2021)

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Abstract

The vast majority of solid–liquid mixing studies have focused on high Reynolds number applications with configurations and impeller geometries adapted to this type of regime. However, the mixing of particles in a viscous fluid is an essential element of many contemporary industries. We used the computational fluid dynamics-discrete element method model previously developed in our group to investigate solid–liquid mixing with close-clearance impellers in the laminar regime of operation. We compared different geometries, that is, the double helical ribbon, anchor, Paravisc™, and Maxblend™ impellers. We investigated the impact of fluid viscosity and compared the results with those obtained with the pitched blade turbine, a more commonly used impeller, based on power consumption for equivalent mixing states. This study highlights that the higher the viscosity of the fluid, the more interesting it is to use close-clearance impellers for their ability to generate a strong shear stress and a strong bulk flow in the entire vessel.

Uncontrolled Keywords

CFD-DEM, close-clearance impeller, laminar regime, non-inertial frame, solid–liquid mixing

Subjects: 1800 Chemical engineering > 1800 Chemical engineering
Department: Department of Chemical Engineering
Research Center: URPEI - Research Center in Industrial Flow Processes
Funders: CRSNG/NSERC
PolyPublie URL: https://publications.polymtl.ca/9150/
Journal Title: AIChE Journal
Publisher: AIChE
DOI: 10.1002/aic.17360
Official URL: https://doi.org/10.1002/aic.17360
Date Deposited: 10 Sep 2021 13:44
Last Modified: 23 Nov 2022 17:42
Cite in APA 7: Delacroix, B., Fradette, L., Bertrand, F., & Blais, B. (2021). Which impeller should be chosen for efficientsolid–liquid mixing in the laminar and transitional regime? AIChE Journal. https://doi.org/10.1002/aic.17360

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