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Permanent link (DOI): https://doi.org/10.7939/R3B109

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Modelling a hydrocyclone for fine particle separation Open Access

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Other title
Subject/Keyword
LES
hydrocyclone
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Ghadirian,Morteza
Supervisor and department
Liu, Qi (Chemical Engineering)
Hayes, Bob (Chemical Engineering)
Xu,Zhenghe (Chemical Engineering)
Examining committee member and department
Xu,Zhenghe (Chemical Engineering)
Liu, Qi (Chemical Engineering)
Liu, Shijie (Paper and Bioprocess Engineering)
Hayes, Bob (Chemical Engineering)
Lange, Carlos (Mechanical Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2014-01-27T15:07:57Z
Graduation date
2014-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Abstract In this study a complete solution methodology is developed for the simulation of hydrocyclones. A commercial software package, Ansys 12 Fluid Dynamics (Fluent), is used to solve the governing conservation equations. Turbulence is modelled using the large eddy simulation, and the discrete particle model is used to predict the particle separation. Two hydrocyclones of different geometries were studied, and the simulation results are compared with the experimental values. There are two key factors for obtaining a reliable result. The first is the domain discretization, and the second is the generation of a consistent initial value, including the establishment of a stable air core. Using the methodology developed, superior agreement is obtained between the predicted and experimental values of pressure, velocity distribution, air core profile and separation efficiency. The developed and validated model is used to investigate the hydrocyclone performance for separation of light and heavy particles in slurry. The effect of overflow pressure, feed flow rate, particle size, vortex finder length, particle concentration and vortex finder diameter were investigated. The prediction of air core profiles demonstrated the accuracy of the simulation. In terms of design variables increasing the vortex finder length is shown to result in an increase in the recovery of light particles in the overflow. In the case of operating variables, the recovery of light particles in the overflow improved by increasing the size of light particles, feed flow rate and decreasing feed solid concentration. The ratio of the vortex finder diameter to the apex diameter was found to be the most important design factor on the hydrocyclone performance.
Language
English
DOI
doi:10.7939/R3B109
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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