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Permanent link (DOI): https://doi.org/10.7939/R3KW6C

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The Effects of Substrate Heterogeneity on Colloid Deposition Open Access

Descriptions

Other title
Subject/Keyword
interactions
model
hydrodynamic
particle
heterogeneity
Brownian
DLVO
Lagrangian
deposition
simulations
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Kemps, Jeffrey A L
Supervisor and department
Bhattacharjee, Subir (Mechanical Engineering)
Examining committee member and department
Yeung, Anthony (Chemical Engineering)
Tang, Tian (Mechanical Engineering)
Lipsett, Michael (Mechanical Engineering)
Kostiuk, Larry (Mechanical Engineering)
Tufenkji, Nathalie (Chemical Engineering, McGill University)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2009-12-17T17:58:43Z
Graduation date
2010-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Heterogeneity of surfaces is often included in mathematical treatments of colloid transport and deposition as an afterthought, if at all. Most previous models of colloid transport and deposition have employed idealizations and simplifications such as assuming smooth collector surfaces with uniform chemical properties. This research proposes a new heterogeneous interaction model (HIM) to account for colloidal forces between particles and heterogeneous substrates. Extending the approach employed with the HIM, the inclusion of convection and diffusion in the model leads to a Lagrangian particle tracking model (PTM) for predicting colloid transport and deposition on a planar substrate containing one or more protruding asperities in the presence of shear flow. An important part of the PTM is an accurate rendering of the fluid flow field around the model substrate, which is obtained from a numerical solution of the Stokes equations. A simple approximation of the particle-substrate hydrodynamic interactions was developed for the PTM based on the universal hydrodynamic correction functions. This model was employed to quantitatively predict how presence of asperities on a collector can influence the deposition of particles on the substrate in shear flow. Flow field modifications due to the substrate's physical heterogeneity -- coupled with hydrodynamic interactions -- and the lateral migration (colloidal) forces near chemically heterogeneous substrates yield remarkably diverse deposition probabilities and deposit morphologies. The general approach of this research, which involves the use of the HIM in conjunction with the Brownian PTM, results in the first simulation tool of its kind to attempt to quantify deposition on heterogeneous substrates.
Language
English
DOI
doi:10.7939/R3KW6C
Rights
License granted by Jeffrey Kemps (jkemps@ualberta.ca) on 2009-12-16T04:31:25Z (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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