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Prediction of gas h...
Prediction of gas holdup in a column flotation cell using computational fluid dynamics (CFD)
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- Mwandawande, I (author)
- Universiteit Stellenbosch,Stellenbosch University
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- Akdogan, G. (author)
- Universiteit Stellenbosch,Stellenbosch University
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- Bradshaw, S. M. (author)
- Universiteit Stellenbosch,Stellenbosch University
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- Karimi, Mohsen, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Snyders, N. (author)
- Universiteit Stellenbosch,Stellenbosch University
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(creator_code:org_t)
- 2019
- 2019
- English.
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In: Journal of the Southern African Institute of Mining and Metallurgy. - : Academy of Science of South Africa. - 2225-6253 .- 2411-9717. ; 119:1, s. 81-95
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Abstract
Subject headings
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- Computational fluid dynamics (CFD) was applied to predict the average gas holdup and the axial gas holdup variation in a 13.5 m high cylindrical column 0.91 m diameter. The column was operating in batch mode. A Eulerian-Eulerian multiphase approach with appropriate interphase momentum exchange terms was applied to simulate the gas-liquid flow inside the column. Turbulence in the continuous phase was modelled using the k-epsilon realizable turbulence model. The predicted average gas holdup values were in good agreement with experimental data. The axial gas holdup prediction was generally good for the middle and top parts of the column, but was over-predicted for the bottom part of the column. Bubble velocity profiles were observed in which the axial velocity of the air bubbles decreased with height in the column. This may be related to the upward increase in gas holdup in the column. Simulations were also conducted to compare the gas holdup predicted with the universal, the Schiller-Naumann, and the Morsi-Alexander drag models. The gas holdup predictions for the three drag models were not significantly different.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- column flotation
- gas holdup
- computational fluid dynamics (CFD)
Publication and Content Type
- art (subject category)
- ref (subject category)
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