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Permanent link (DOI): https://doi.org/10.7939/R3FK5N

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Yield stresses of mixtures with bimodal size distributions Open Access

Descriptions

Other title
Subject/Keyword
Fine particle slurry
Coarse particle concentration
Coarse particle size
Yield stress
Viscometer
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Rahman, Md. Hafizur
Supervisor and department
Sanders, R. Sean (Chemical and Materials Engineering)
Examining committee member and department
Bhattacharjee, Subir (Mechanical Engineering)
Liu, Qingxia (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-03-18T20:37:40Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
The addition of coarse particles to a flocculating fine particle slurry increases the Bingham yield stress of the resulting mixture, which can drastically alter the laminar-to-turbulent transition velocity. The objective of this study is to quantify the effect of coarse particle size and volume concentration on mixture rheology. Fine particle (kaolin) mixtures of 10% to 22% (by volume) were prepared, to which sand particles were added to provide a coarse solid concentration of 5% to 20% (by volume). Sand particles of two different sizes – 90 and 190 microns – were added and these kaolin-sand-water mixtures tested with a concentric cylinder viscometer. At higher total solids concentrations, the Bingham yield stress of the bimodal mixture can increase by as much as 80% over that of a kaolin-only slurry. Coarse particle diameter had little effect. This study demonstrates that the use of existing correlations should be eschewed. System-specific high-quality measurements are necessary.
Language
English
DOI
doi:10.7939/R3FK5N
Rights
License granted by Md. Rahman (mhrahman@ualberta.ca) on 2011-03-18T18:44:05Z (GMT): 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 the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein 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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