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Permanent link (DOI): https://doi.org/10.7939/R3663X

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Simulations of agitated dilute non-Newtonian suspensions Open Access

Descriptions

Other title
Subject/Keyword
non-Newtonian suspension, agitation, stirred tank
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Sekyi, Elorm
Supervisor and department
J. Derksen (Chemical & Materials Eng. Dept.)
Examining committee member and department
M. Flynn (Mechanical Eng. Dept.)
S. Kresta (Chemical & Materials Eng. Dept.)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2009-09-21T15:27:34Z
Graduation date
2009-11
Degree
Master of Science
Degree level
Master's
Abstract
Particle distribution and settling in suspensions with non-Newtonian liquids agi- tated with a Rushton turbine in a lab-scale tank have been studied. The rheology of the non-Newtonian liquids can be described by the power-law, Bingham and Herschel-Bulkley fluid models. The dynamics of the dispersed phase – settling particles (size 0.65mm) is modeled by a Lagrangian tracking approach while the liquid phase is resolved by the lattice-Boltzmann method. Qualitative insight emerging from exploration of shear-thinning/thickening, New- tonian, yield-stress fluid models at Reynolds number, Re=6 × 103 , 8.5 × 103 and 1.25 × 104 indicate that bottom particle concentration is highest in power-law liq- uids than in Newtonian; while yield stress fluids had more uniform particle con- centration and least bottom concentration. Also, turbulent kinetic energy and vis- cous dissipation are highest in the Newtonian liquid. Extra viscous diffusion due to fluctuating non-Newtonian viscosity in the turbulent kinetic energy equation attributes to these differences.
Language
English
DOI
doi:10.7939/R3663X
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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