Using CFD to understand chaotic mixing in laminar stirred tanks

Zalc, Jeffrey M.; Szalai, E. S.; Álvarez, Mario Moisés; Muzzio, Fernando J.

doi:10.1002/aic.690481004

Cited by 69 publications

(47 citation statements)

References 28 publications

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“…Both cases differ from the experimental streamlines [22], in that the jet appears to die out over a distance of 10 cm for the simulations, whilst the vortex above the impeller is observed to reach the wall for the experimental study. This feature of the flow is consistent with later investigations [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, it must be noted that the tank configuration modelled in [21] is markedly different with three impellers agitating the liquid.…”

Section: Nagata Test Case [22]contrasting

confidence: 40%

“…The modelling of stirred tanks has been long established to characterise rotational flow [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. For the majority of numerical studies of stirred tanks the liquid surface is not considered to deform with agitation (i.e.…”

Section: Introductionsupporting

confidence: 38%

“…The use of the free slip surface is validated by the conditions in the tank that reduce the likelihood of vortex formation (i.e. baffles [8-9, 13, 15, 18], location, size and shape of the impeller and the tank flow regime [6][7][8][9][11][12][13][14][15][16][17][18][19][20][21]). …”

Section: Introductionmentioning

confidence: 42%

See 2 more Smart Citations

Modelling vortex formation in an unbaffled stirred tank reactors

Cartland-Glover¹,

Fitzpatrick²

2007

Chemical Engineering Journal

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Section: Nagata Test Case [22]contrasting

confidence: 40%

Section: Introductionsupporting

confidence: 38%

See 1 more Smart Citation

Modelling vortex formation in an unbaffled stirred tank reactors

Cartland-Glover¹,

Fitzpatrick²

2007

Chemical Engineering Journal

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“…The numerical predictions were compared with the literature results using particle image velocimetry. Zalc et al [13] explored laminar flow in an impeller stirred tank using CFD tools. They extended the analysis to include short and long time mixing performance as a function of the impeller speed.…”

Section: Laboratory Of Electro-mechanic Systems (Lasem) National Schmentioning

confidence: 45%

A Study of Mixing Structure in Stirred Tanks Equipped with Multiple Four-Blade Rushton Impellers

Driss¹,

Karray²,

Chtourou³

et al. 2012

Archive of Mechanical Engineering

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The effect of multiple Rushton impellers configurations on hydrodynamics and mixing performance in a stirred tank has been investigated. Three configurations defined by one, two and three Rushton impellers are compared. Results issued from our computational fluid dynamics (CFD) code are presented here concerning fields of velocity components and viscous dissipation rate. These results confirm that the multi-impellers systems are necessary to decrease the weaken zones in each stirred tanks. The experimental results developed in this work are compared with our numerical results. The good agreement validates the numerical method.

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“…For example, Zalc et al [8] was simulated a laminar flow in an impeller stirred tank using CFD tools. They were studied an effect of mixing time performance as a function of the impeller speed.…”

Section: Introductionmentioning

confidence: 44%

An Effect of Fractal Baffles and Impellers with Double Stage 4-Blade Rushton Turbine to Fluid Flow Behaviour in Stirred Tank

Manshoor

Yusof

Laily

et al. 2014

AMM

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Abstract. The stirred tank is widely used in many industries to obtain the desired type of fluid mixing. In the context of mixing process, two different fluids and have a different properties will mix in a single equipment to produce another fluid with a new property. In this research, a new approach of stirred tank which is containing a new design of baffles and impellers was proposed for fluid mixing. The new design of baffles and impellers that proposed here are used a fractal pattern for both parts in the stirred tank. Implementing a fractal pattern for baffles and impellers in stirred tank believe will influence the flow characteristic inside the stirred tank, hence will improve a mixing performance. In order to investigate the kinds of flow properties, a Particle Image Velocimetry (PIV) technique with 1 µm seeding particle was used. Four configurations were tested which are normal baffles and normal impellers, normal baffles and fractal impellers, fractal baffles and normal impellers, and the last configuration is fractal baffles and fractal impellers. In this study, dual Rushton impellers with 4 blades were used with the configurations mentioned. The result shows the significant flow field capture by PIV measurement on each configuration. By using fractal impeller some vortex are shown in the tank and high velocity vector on flow field compare with normal impeller while normal baffles gives high velocity vector depends on the configuration were used. From the results, it was showed that the fractal design can give a certain level of mixing efficiency in stirred tank. The PIV technique also gives good flow visualization in order to determine the flow pattern in stirred tank with a new concept of baffles and impellers.

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Using CFD to understand chaotic mixing in laminar stirred tanks

Abstract: High-accuracy CFD results for laminar flow in a stirred tank agitated by three Rushton

Cited by 69 publications

References 28 publications

Modelling vortex formation in an unbaffled stirred tank reactors

Modelling vortex formation in an unbaffled stirred tank reactors

A Study of Mixing Structure in Stirred Tanks Equipped with Multiple Four-Blade Rushton Impellers

An Effect of Fractal Baffles and Impellers with Double Stage 4-Blade Rushton Turbine to Fluid Flow Behaviour in Stirred Tank

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