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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 and Bruno Blais

Article (2021)

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Cite this document: 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. doi:10.1002/aic.17360
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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

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
Department: Département de génie chimique
Research Center: URPEI - Unité de recherche en procédés d'écoulements industriels
Funders: CRSNG/NSERC
Date Deposited: 10 Sep 2021 13:44
Last Modified: 11 Sep 2021 01:20
PolyPublie URL: https://publications.polymtl.ca/9150/
Document issued by the official publisher
Journal Title: AIChE Journal
Publisher: AIChE
Official URL: https://doi.org/10.1002/aic.17360

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