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Which impeller should be chosen for efficient solid-liquid mixing in the laminar regime?
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  • Bastien Delacroix,
  • Louis Fradette,
  • Francois Bertrand,
  • Bruno Blais
Bastien Delacroix
Ecole Polytechnique de Montreal
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Louis Fradette
Ecole Polytechnique de Montreal
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Francois Bertrand
Ecole Polytechnique de Montreal
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Bruno Blais
Ecole Polytechnique de Montreal
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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 CFD-DEM 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$^{TM}$, and Maxblend$^{TM}$ 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.

Peer review status:ACCEPTED

13 Jan 2021Submitted to AIChE Journal
18 Jan 2021Submission Checks Completed
18 Jan 2021Assigned to Editor
01 Feb 2021Reviewer(s) Assigned
03 Mar 2021Editorial Decision: Revise Major
15 Apr 20211st Revision Received
29 Apr 2021Submission Checks Completed
29 Apr 2021Assigned to Editor
03 May 2021Reviewer(s) Assigned
01 Jun 2021Editorial Decision: Accept