Drag models, solids concentration and velocity distribution in a stirred tank

Aoyi Ochieng, Maurice S. Onyango

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Drag force influences both the particle suspension and solids concentration distribution in a stirred tank. The influence of drag models on the prediction of solids suspension in a tank stirred by a hydrofoil impeller was studied in the present work using computational fluid dynamics (CFD) and experimental techniques. A comparison was made between the drag models based on Reynolds number only and those that take solid volume fraction into account or those that account for the effect of the free stream turbulence. One of the drag models investigated was a function of the energy dissipation rate, and therefore, the influence of the methods of determining the energy dissipation rate on the prediction of solids suspension was investigated. It was shown that a better agreement between the CFD simulation and experimental results can be obtained using drag models based on solids volume fraction than those that are based on Reynolds number only.
Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPowder Technology
Volume181
Issue number1
DOIs
Publication statusPublished - 2008

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Velocity distribution
Drag
Suspensions
Volume fraction
Energy dissipation
Computational fluid dynamics
Reynolds number
Hydrofoils
Turbulence
Computer simulation

Cite this

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Drag models, solids concentration and velocity distribution in a stirred tank. / Ochieng, Aoyi; Onyango, Maurice S.

In: Powder Technology, Vol. 181, No. 1, 2008, p. 1-8.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Drag models, solids concentration and velocity distribution in a stirred tank

AU - Ochieng, Aoyi

AU - Onyango, Maurice S.

PY - 2008

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AB - Drag force influences both the particle suspension and solids concentration distribution in a stirred tank. The influence of drag models on the prediction of solids suspension in a tank stirred by a hydrofoil impeller was studied in the present work using computational fluid dynamics (CFD) and experimental techniques. A comparison was made between the drag models based on Reynolds number only and those that take solid volume fraction into account or those that account for the effect of the free stream turbulence. One of the drag models investigated was a function of the energy dissipation rate, and therefore, the influence of the methods of determining the energy dissipation rate on the prediction of solids suspension was investigated. It was shown that a better agreement between the CFD simulation and experimental results can be obtained using drag models based on solids volume fraction than those that are based on Reynolds number only.

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DO - 10.1016/j.powtec.2007.03.034

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