CFD Modelling of Liquid Homogenization in Stirred Tanks with One and Two Impellers Using Large Eddy Simulation

Jahoda, M.; Moštěk, M.; Kukuková, Alena; Machoň, Václav

doi:10.1205/cherd06183

Cited by 90 publications

(63 citation statements)

References 15 publications

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“…It is well known from the literature that large eddy simulation (LES) can predict excellently the time-averaged mean and turbulence flows (Derksen, 2001;Revstedt et al 1998, Yeoh et al, 2004Hartmann et al, 2004;Li et al, 2007;Jahoda et al, 2007;Tyagi et al, 2007;Yapici et al, 2008). It is also possible to solve the turbulence flow in stirred tanks directly using the exact Navier-Stokes equations without any modelling, but this requires a grid and time step that resolves even the smallest eddies.…”

Section: Simulation Of Single Phase Flow In Baffled Stirred Tanksmentioning

confidence: 99%

Computational Fluid Mixing

Rielly

Gimbun

2009

Food Mixing

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Section: Simulation Of Single Phase Flow In Baffled Stirred Tanksmentioning

confidence: 99%

Computational Fluid Mixing

Rielly

Gimbun

2009

Food Mixing

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“…Although the development of mixing processes is nowadays based mostly on CFD (Computational Fluid Dynamics) where the LES (Large Eddy Simulation) approach is commonly used e.g. [1], [2], [3], [4], [5], the DNS (Direct Numerical Simulation) approach is also under development [6]. The large part of published results in this field were summarised in [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation and accuracy of the local velocity data measurements in an agitated vessel

Kysela

Konfršt

Chára

et al. 2014

EPJ Web of Conferences

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Abstract. Velocity measurements of the flow field in an agitated vessel are necessary for the improvement and better understanding of the mixing processes. The obtained results are used for the calculations of the impeller pumping capacity, comparison of the power consumption etc. We performed various measurements of the local velocities in an agitated vessel final results of which should be processed for several purposes so it was necessary to make an analysis of the obtained data suitability and their quality. Analysed velocity data were obtained from the LDA (Laser Doppler Anemometry) and PIV (Particle Image Velocimetry) measurements performed on a standard equipment where the flat bottomed vessel with four baffles was agitated by the six-blade Rushton turbine. The results from both used methods were compared. The frequency analyses were examined as well as the dependency of the data rates, time series lengths etc. The demands for the data processed in the form of the ensemble-averaged results were also established.

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“…They consist of a strong primary loop in the impeller discharge region and a smaller secondary loop below the impeller. Usually, the flow field generated by down-pumping multiple impellers with large values of impeller separation (also known as S/H values) is such that the downward discharge and circulation loops are well defined for each impeller as in studies conducted by [25] [26]. However, in the present study, it is observed that the loops are more pronounced in the discharge region of the lower impeller.…”

Section: Resultsmentioning

confidence: 46%

Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation

Dagadu¹,

Stęgowski²,

Furman³

et al. 2014

JAMP

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Experimental residence time distribution (RTD) measurement and computational fluid dynamics (CFD) simulation are the best methods to study the hydrodynamics of process flow systems. However, CFD approach leads to better understanding of the flow structure and extent of mixing in stirred tanks. In the present study, CFD models were used to simulate the flow in an industrial gold leaching tank. The objective of the investigation was to characterize the flowfield generated within the tank after process intensification. The flow was simulated using an Eulerian-Eulerian multi-fluid model where the RANS standard -ε mixture model and a multiple reference frame approach were used to model turbulence and impeller rotation respectively. The simulated flowfield was found to be in agreement with the flow pattern of pitched blade axial-flow impellers that was used for mixing. The leaching tank exhibited good "off-bottom suspension" which reveals minimum deposition of gold ore particles on the bottom of the leaching tanks. Simulation results were consistent with experimental results obtained from a radioactive tracer investigation. CFD approach gave a better description of the flow structure and extent of mixing in a leaching tank. Hence it could be a preferred approach for flow system analysis where the cost of experimentation is high.

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CFD Modelling of Liquid Homogenization in Stirred Tanks with One and Two Impellers Using Large Eddy Simulation

Cited by 90 publications

References 15 publications

Computational Fluid Mixing

Computational Fluid Mixing

Evaluation and accuracy of the local velocity data measurements in an agitated vessel

Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation

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