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Terminal Settling Velocity of a Sphere in a non-Newtonian fluid Open Access


Other title
apparent viscosity
viscoplastic fluid
terminal settling velocity
Type of item
Degree grantor
University of Alberta
Author or creator
Shokrollahzadeh, Ameneh
Supervisor and department
Sanders, Sean, R. (Department of Chemical and Materials Engineering)
Examining committee member and department
Nazemifard, Neda (Department of Chemical and Materials Engineering)
de Klerk, Arno (Department of Chemical and Materials Engineering)
Department of Chemical and Materials Engineering
Chemical engineering
Date accepted
Graduation date
Master of Science
Degree level
The production and disposal of thickened tailings continue to grow in importance in the mining industry around the world. Prediction of particle settling during transportation and handling processes is a critical element in system design and operation. Wilson et al. (2003) presented a direct method that was able to provide reasonably accurate predictions for the terminal settling velocity of a sphere in a fluid with a yield stress. The application of this method is limited; if the fluid yield stress is larger than the reference shear stress proposed by this method (0.3τ ̅≤τ_(y )), the correlation cannot be used. The current study presents measurements of fall velocities of precision spheres in concentrated Kaolinite-water suspensions (10.6% to 21.7% by volume). Both Casson and Bingham models have been used to model the fluid rheology which provided yield stress values in the range of 1.3 Pa to 30 Pa, depending primarily on the clay concentration. An analogy of the Wilson-Thomas analysis for pipe flow of non-Newtonian fluids (Wilson and Thomas, 1985) has been used to develop a new method for predicting the terminal settling velocity of a sphere in a viscoplastic fluid. There are no limits for applicability of the new method and its performance on the experimental results from this study, along with data taken from the literature, shows higher accuracy in its predictions than the direct method of Wilson et al. (2003).
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. 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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