CFD Prediction of Flow and Homogenization in a Stirred Vessel: Part I Vessel with One and Two Impellers

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

doi:10.1002/ceat.200500094

Cited by 32 publications

(28 citation statements)

References 10 publications

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“…The experiments were performed in a similar way to Part I [1], except for adjustments for multi-impeller systems, as described by Jahoda [8]. The differences from Part I are listed in this paragraph.…”

Section: Methodsmentioning

confidence: 99%

“…The signal coming from the probes was processed by a conductivity meter, digitised by an A/D converter, and registered by a computer for further processing (see Part I, [1]). Ten measurements were made for each set-up.…”

Section: Methodsmentioning

confidence: 99%

“…A comparison was made between simulated data and experiments for one-and two-impeller systems and was presented in Part I [1]. The effect of the lowest impeller off-bottom clearance, number of impellers used, and impeller type on the tracer distribution was studied.…”

mentioning

confidence: 99%

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CFD Prediction of Flow and Homogenization in a Stirred Vessel: Part II Vessel with Three and Four Impellers

Kukuková

Moštěk

Jahoda

et al. 2005

Chem. Eng. Technol.

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This article deals with CFD simulations of flow inside stirred vessels equipped with three and four radial or axial impellers mounted on the same shaft. A comparison was made between simulated data and experiments for one-and two-impeller systems and was presented in Part I [1]. The effect of the lowest impeller off-bottom clearance, number of impellers used, and impeller type on the tracer distribution was studied. The simulations were mainly focused on the grid size and type and the analysis of the concentration curves in each impeller section. The predicted velocity fields, power and pumping numbers, concentration curves, and mixing times were validated with experimental data. The simulation results show the significant influence of the grid density on the velocity profiles and power and pumping numbers in contrast to the low impact on the concentration curves. A better prediction of the concentration curves was reached when radial impellers were used; the mixing times were generally over-predicted.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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CFD Prediction of Flow and Homogenization in a Stirred Vessel: Part II Vessel with Three and Four Impellers

Kukuková

Moštěk

Jahoda

et al. 2005

Chem. Eng. Technol.

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“…Jahoda and colleagues have worked for more than a decade on analyzing the homogenization of reactors with high aspect ratios, agitated with multiple impellers [10][11][12][13]. Their experiments [10] and simulations [11][12][13] for multiple Rushton and pitched-blade turbines are an excellent base for understanding the flow field in slim reactors with H/T of up to 4.0. Additionally, the works of Jaworski et al [14] are recommended.…”

Section: Introductionmentioning

confidence: 99%

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Maaß¹,

Eppinger²,

Altwasser³

et al. 2011

Chem Eng & Technol

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Previous studies have shown the great potential, but also the great challenges, in handling slim reactors often used for polymerization reactions. Experiments and simulations were carried out in reactors with aspect-to-diameter ratios of up to 5, to test and to evaluate the mixing and dispersion efficiency for liquid-liquid systems of single-and multiple-stage impellers. Therefore, power consumption, mixing time and minimum dispersion speed were determined for five different stirrer types under turbulent conditions. It was found that the dimensionless mixing time is highly sensitive to the configuration of the impellers, with almost no dependency on the turbulent power number. Another focus was the analysis of the effect of the baffles. The influence of the baffle length in slim reactors on the mixing time and the macroscopic flow field was determined.

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“…l t is the turbulent viscosity, and Sc t is the turbulent Schmidt number, which was set to 0.7 [9,25].…”

Section: Governing Equationsmentioning

confidence: 99%

Experimental and Numerical Studies of the Flow Field in a Stirred Tank Equipped with Multiple Side‐Entering Agitators

2011

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The flow field and the macro-mixing process in a stirred tank equipped with four side-entering agitators were investigated experimentally and numerically. Experiments were conducted using two-dimensional particle image velocimetry (PIV) measurements to characterize the flow field at different positions in the vessel. The computational fluid dynamics (CFD) simulation was performed by the software Fluent 6.3, using the standard k-e turbulent model and the multiple reference frame together with the sliding mesh technique. The macro-mixing process was also discussed using CFD and decolorization experiments. The effects of the tracer detection positions and some mounting parameters in the mixing system were discussed. The results show that the mixing process was dominated by the flow field pattern in the stirred tank. According to the mixing times under different conditions using CFD simulation, the mounting parameters including inclination angle, plunging length and mounting height of the shaft were optimized.

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CFD Prediction of Flow and Homogenization in a Stirred Vessel: Part I Vessel with One and Two Impellers

Cited by 32 publications

References 10 publications

CFD Prediction of Flow and Homogenization in a Stirred Vessel: Part II Vessel with Three and Four Impellers

CFD Prediction of Flow and Homogenization in a Stirred Vessel: Part II Vessel with Three and Four Impellers

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Experimental and Numerical Studies of the Flow Field in a Stirred Tank Equipped with Multiple Side‐Entering Agitators

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