Trailing Vortices of Rushton Turbine

Ranade, Vivek V.; Perrard, M.; Sauze, Nathalie Le; Xuereb, Catherine; Bertrand, J.

doi:10.1205/026387601528471

Cited by 67 publications

(14 citation statements)

References 11 publications

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“…(Derksen et al, 1999;Ranade et al, 2001). Hence, the region under the impeller seems to be useful for comparisons of turbulence flow changes dependent on operating conditions.…”

Section: Velocities Under the Rushton Turbine (Results Of Piv Measurementioning

confidence: 99%

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

Kysela¹,

Konfršt²,

Fořt³

et al. 2014

Chemical and Process Engineering

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The velocity field around the standard Rushton turbine was investigated by the Laser Doppler Anemometry (LDA) and Particle Image Velocimetry (PIV) measurements. The mean ensembleaveraged velocity profiles and root mean square values of fluctuations were evaluated at two different regions. The first one was in the discharge stream in the radial direction from the impeller where the radial flow is dominant and it is commonly modelled as a swirling turbulent jet. The validity range of the turbulent jet model was studied. The second evaluated region is under the impeller where flow seems to be at first sight rather rigorous but obtained results show nonnegligible values of fluctuation velocity.

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“…(Derksen et al, 1999;Ranade et al, 2001). Hence, the region under the impeller seems to be useful for comparisons of turbulence flow changes dependent on operating conditions.…”

Section: Velocities Under the Rushton Turbine (Results Of Piv Measurementioning

confidence: 99%

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

Kysela¹,

Konfršt²,

Fořt³

et al. 2014

Chemical and Process Engineering

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“…Because the trailing vortices were readily recognised in PIV results [12], [16], [9] and, moreover, the LDA data are unevenly sampled [19] in contrary with the PIV data, the autocorrelation functions and power spectral density were compared. For the unevenly sampled LDA data the slot correlation technique was used [20], [19].…”

Section: Frequency Analysismentioning

confidence: 99%

“…[10], [11], [12], [13], [14], [15] and as well as the PIV measurements e.g. [16], [17], [18]. In the most of above cited experiments, the cylindrical vessel with standard Rushton impeller had been used [10], [13], [17], [18].…”

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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“…The laser Doppler anemometry (LDA) is one of the non-intrusive methods available to measure local velocities of the flow field. The LDA is capable of studying transient flow relatively close to the wall, providing single point time-averaged measurements [6][7]. This technique requires seeding particles which are assumed to track the flow dynamics following the principles of Stokes number [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement and CFD simulation on the hydrodynamics of an internal-loop airlift reactor

2017

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Abstract. This paper concerns with the experimental measurement and computational fluid dynamics simulation on local hydrodynamics of a gas-liquid internal-loop airlift reactor. The aim of this work is to study the sensitivity of the drag models and the significance of considering the lift force on the predictive accuracy of the simulation. The experimental analysis was carried out using laser Doppler anemometry at three different heights (i.e. Y = 0.20 m, 0.30 m and 0.38 m) across the riser and downcomer at volumetric flow rate of 0.30 m 3 /h to provide validation for the simulation results. A transient three-dimensional gasliquid internal-loop airlift reactor was carried out using FLUENT 16.2 by implementing the two-fluid model approach. The Eulerian-Eulerian multiphase and standard k-İ dispersed turbulence model were employed in this study. Results suggest that the spherical drag model performed poorly and that the drag model governed by Rayleigh-Taylor shows promising accuracy in the prediction of overall mean axial liquid velocity. On the other hand, the consideration of lift model shows slightly improvement in accuracy. These findings may serve as a guidance for future scale-up and design of airlift reactor studies

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Trailing Vortices of Rushton Turbine

Cited by 67 publications

References 11 publications

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

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

Experimental measurement and CFD simulation on the hydrodynamics of an internal-loop airlift reactor

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