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Permanent link (DOI): https://doi.org/10.7939/R38911X86

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Simulations of Liquid Spreading and Particle Aggregation in Gas-Fluidized Beds Open Access

Descriptions

Other title
Subject/Keyword
aggregation
wet particles
gas fluidization
lattice-Boltzmann method
liquid spreading
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wasylkiewicz, Monika J
Supervisor and department
Nikrityuk, Petr (Chemical and Materials Engineering)
Examining committee member and department
Nikrityuk, Petr (Chemical and Materials Engineering)
Flynn, Morris (Mechanical Engineering)
Reid, Kevin (Syncrude Canada Ltd.)
Sanders, Sean (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2014-01-30T11:40:47Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Introduction of a binding or reacting liquid into a gas-solid fluidized bed is common in industrial processes (e.g. fluid coking, catalytic cracking, granulation). Ability of the liquid to spread and the attractive effect on particles due to liquid bridge formation alter the fluidization behavior and process efficiency. Direct numerical simulations are performed using the lattice-Boltzmann method, with liquid modeled as a scalar transferred during particle collisions. A liquid spreading model is introduced based on a liquid bridge growth rate, and liquid spreading is studied and analyzed in terms of diffusion coefficients. Then, a system of homogeneously wetted particles is simulated, with an attractive force applied between adjacent particles. Aggregate sizes and fluidization behavior are examined. Liquid diffusion is slower horizontally than vertically. The relation between liquid spreading and solids volume fraction depends on liquid viscosity and surface tension. Systems simulated generally completely aggregate, with aggregation resulting in slip velocity increases.
Language
English
DOI
doi:10.7939/R38911X86
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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File title: Simulations of Liquid Spreading and Particle Aggregation in Gas-Fluidized Beds
File author: Monika Wasylkiewicz
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