Towards improved hydrocyclone models - Contributions from computational fluid dynamics

Narasimha, M., Brennan, Matthew S., Mainza, A. and Holtham, Peter N. (2010). Towards improved hydrocyclone models - Contributions from computational fluid dynamics. In: XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future. International Mineral Processing Congress 2010, Brisbane, Qld, Australia, (3299-3312). 6-10 September, 2010.

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Author Narasimha, M.
Brennan, Matthew S.
Mainza, A.
Holtham, Peter N.
Title of paper Towards improved hydrocyclone models - Contributions from computational fluid dynamics
Conference name International Mineral Processing Congress 2010
Conference location Brisbane, Qld, Australia
Conference dates 6-10 September, 2010
Convener Ralph J. Holmes
Proceedings title XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future
Journal name XXV International Mineral Processing Congress 2010, IMPC 2010
Place of Publication Carlton, VIC, Australia
Publisher Australasian Institute of Mining and Metallurgy
Publication Year 2010
Year available 2010
Sub-type Fully published paper
ISBN 9781921522284
Volume 4
Start page 3299
End page 3312
Total pages 14
Collection year 2011
Language eng
Abstract/Summary The complex nature of multi-phase fl ow in hydrocyclones has led designers to rely on empirical equations for predicting the performance. These empirical relationships are derived from an analysis of experimental data and include the effect of operational and geometric variables. A number of classifying cyclone models have been developed over the past three decades (Plitt, 1976 and Nageswararao, 1978). The problem with empirical cyclone models is that they cannot be used outside the range of conditions under which they were developed. A better empirical cyclone model using mathematical structures based on fluid mechanics is highly desirable. In this paper simulations of various cyclones were conducted in FLUENT where the particle phases were simulated using the Mixture model. The turbulence was resolved using Large Eddy Simulation (LES) model. The simulations confirm that the tangential velocity is the key in separating the particles. Further multi-phase analysis shows the turbulence dispersion also affects the fi ne particle segregation. Also, the experimental and the CFD data indicate that particle separation inside the cyclone is also affected by the feed solids concentration and size distribution, primarily in terms of the slurry viscosity and the particle hindered settling. Mathematical correlations have been developed which include these effects and have been incorporated in an improved empirical hydrocyclone model.
Keyword Hydrocyclones
Computational fluid dynamics
Turbulence
Slurry viscosity
Mathematical models
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 14 Dec 2010, 14:00:07 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre