CFD simulation of the hydrodynamics and mixing time in a stirred tank

Aoyi Ochieng, Maurice S. Onyango

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Hydrodynamics and mixing efficiency in stirred tanks influence power draw and are therefore important for the design of many industrial processes. In the present
study, both experimental and simulation methods were employed to determine the flow fields in different mixing tank configurations in a single phase
system. Laser Doppler velocimetry (LDV) and computational fluid dynamics (CFD) techniques were used to determine the flow fields in systems with and without a draft tube. There was reasonable agreement between the simulation
and experimental results. It was shown that the use of a draft tube with a Rushton turbine and hydrofoil impeller resulted in a reduction in the homogenization
energy by 19.2 and 17.7%, respectively. This indicates that a reduction in the operating cost can be achieved with the use of a draft tube in a stirred tank and there would be a greater cost reduction in a system stirred by the Rushton turbine compared to that stirred by a propeller.
Original languageEnglish
Pages (from-to)379-386
Number of pages8
JournalChemical Industry and Chemical Engineering Quarterly
Volume16
Issue number4
DOIs
Publication statusPublished - 2010

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Flow fields
Computational fluid dynamics
Turbines
Hydrodynamics
Hydrofoils
Computer simulation
Propellers
Cost reduction
Operating costs
Velocity measurement
Lasers

Cite this

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title = "CFD simulation of the hydrodynamics and mixing time in a stirred tank",
abstract = "Hydrodynamics and mixing efficiency in stirred tanks influence power draw and are therefore important for the design of many industrial processes. In the presentstudy, both experimental and simulation methods were employed to determine the flow fields in different mixing tank configurations in a single phasesystem. Laser Doppler velocimetry (LDV) and computational fluid dynamics (CFD) techniques were used to determine the flow fields in systems with and without a draft tube. There was reasonable agreement between the simulationand experimental results. It was shown that the use of a draft tube with a Rushton turbine and hydrofoil impeller resulted in a reduction in the homogenizationenergy by 19.2 and 17.7{\%}, respectively. This indicates that a reduction in the operating cost can be achieved with the use of a draft tube in a stirred tank and there would be a greater cost reduction in a system stirred by the Rushton turbine compared to that stirred by a propeller.",
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CFD simulation of the hydrodynamics and mixing time in a stirred tank. / Ochieng, Aoyi; Onyango, Maurice S.

In: Chemical Industry and Chemical Engineering Quarterly, Vol. 16, No. 4, 2010, p. 379-386.

Research output: Contribution to journalArticle

TY - JOUR

T1 - CFD simulation of the hydrodynamics and mixing time in a stirred tank

AU - Ochieng, Aoyi

AU - Onyango, Maurice S.

PY - 2010

Y1 - 2010

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AB - Hydrodynamics and mixing efficiency in stirred tanks influence power draw and are therefore important for the design of many industrial processes. In the presentstudy, both experimental and simulation methods were employed to determine the flow fields in different mixing tank configurations in a single phasesystem. Laser Doppler velocimetry (LDV) and computational fluid dynamics (CFD) techniques were used to determine the flow fields in systems with and without a draft tube. There was reasonable agreement between the simulationand experimental results. It was shown that the use of a draft tube with a Rushton turbine and hydrofoil impeller resulted in a reduction in the homogenizationenergy by 19.2 and 17.7%, respectively. This indicates that a reduction in the operating cost can be achieved with the use of a draft tube in a stirred tank and there would be a greater cost reduction in a system stirred by the Rushton turbine compared to that stirred by a propeller.

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