Computational Fluid Dynamics Modeling of a Bench-scale Pump−Mixer:  Head, Power and Residence Time Distribution

Singh, Kunal Kumar; Mahajani, Sanjay M.; Shenoy, K.T.; Ghosh, Sumana

doi:10.1021/ie061102m

Cited by 18 publications

(17 citation statements)

References 39 publications

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“…Adequacy of the standard k-e model to predict the macroscopic performance parameters of pump-mix impellers has been demonstrated in two earlier studies. 23,24 SIMPLE algorithm was used for pressure-velocity coupling and second order upwind scheme was used for discretization of momentum and turbulence equations. For sliding mesh simulations, the interface separating the inner rotating volume surrounding the impeller and outer stationary volume surrounding the baffles was located midway between the impeller tip and baffle tip.…”

Section: Cfd Simulationsmentioning

confidence: 99%

“…Although numerous studies on mixers have been reported in the literature, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] very few studies have been reported on pump-mixers. [23][24][25][26][27][28] Though, several commercial designs of pump-mixers like IMI design, Krebs design, Denevr design, Kemira design, Davy-Powergas design, and General Mills design have been reported in the open literature, only qualitative features have been discussed. 29,30 Figure 1 shows the diagram of a pump-mix mixer settler with intrastage recycling of the light phase.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, there exist only two published studies on CFD simulation of pump-mixers. 23, 24 The first of these studies 23 was done for a pilot scale pump-mixer (0.270 m 3 ) employing a TSTRTB. Total 27 CFD simulations to understand the effect of impeller off-bottom clearance, blade width, number of blades, impeller diameter, flow rate and impeller speed on head and power characteristics were carried out.…”

Section: Introductionmentioning

confidence: 99%

“…The second study 24 was carried out on a bench-scale pump-mixer (0.011 m 3 ). Again a TSTRTB was used in the study.…”

Section: Introductionmentioning

confidence: 99%

“…This approach has earlier been used for compartment modeling of a bench-scale pump-mixer. 24 Similar approach has been used here to quantify the goodness of flow field produced by BSTRTB. The details of obtaining the CFD predicted virtual exit age distribution curves and fitting the compartment model are omitted here for brevity.…”

mentioning

confidence: 99%

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CFD modeling of pump‐mix action in continuous flow stirred tank

et al. 2007

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The present work involves Computational Fluid Dynamics (CFD) modeling and validation of head and power characteristics of a Top Shrouded Turbine with Nonradial Rectangular Blades (TSTNRB) operated in backswept mode. Following the successful validation reported here and in two previous studies by the authors. CFD has been used to simulate the performance of different kinds of impellers viz. Straight Blade Paddle (SBP), Rushton Turbine (RT), Top Shrouded Turbine with Radial Rectangular Blades (TSTRRB), Top Shrouded Turbine with Radial Trapezoidal Blades (TSTRTB), Top Shrouded Turbine with Non‐radial Rectangular Blades (TSTNRB), Top Shrouded Turbine with Curved Blades (TSTCB), and Both side Shrouded Turbine with Radial Trapezoidal Blades (BSTRTB), to compare them for pump‐mix action. Baffle‐impeller interaction has been modeled using the sliding mesh approach. Standard k‐ε model has been used for turbulence modeling. The power number, head number, and flow number have been computed for each impeller. The impellers have been rated on the basis of head generated by them for equal specific power input. An attempt has been made to explain why different impellers operating at the same speed and handling the same inlet flow rate should give different heads. How this insight can be used to conceptualize better designs of pump‐mix impeller is illustrated. © 2007 American Institute of Chemical Engineers AIChE J, 2008

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Section: Cfd Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The second study 24 was carried out on a bench-scale pump-mixer (0.011 m 3 ). Again a TSTRTB was used in the study.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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CFD modeling of pump‐mix action in continuous flow stirred tank

et al. 2007

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Non‐invasive mixing time estimation in unbaffled stirred tank: An ultrasonic approach

et al. 2022

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Estimation of mixing time is an essential aspect in characterization of stirred tanks. In this work, we report a novel, non‐invasive technique to estimate mixing time in an unbaffled stirred tank using a contact type ultrasonic sensor. Variation in speed of sound in stirred tank is measured by ultrasound and is used to determine the mixing time of solutions. A sensing time of 16.6 ms (~60 Hz) is achieved which leads to an estimation of the mixing process dynamics under forced vortex conditions. The method is validated against colorimetric technique using a dye. The technique is thereafter used to determine mixing time under different operating (impeller speed) and geometrical (impeller design, vessel diameter, and off‐bottom clearance) conditions. Though the results presented are specific to unbaffled stirred tank, the method reported is general and can be used in any kind of stirred tank.

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Numerical simulations to evaluate basic geometrical shapes as headers for equal liquid flow distribution

Darekar

Singh

Shenoy

et al. 2014

Asia-Pacific J Chem Eng

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The study presents computational fluid dynamics (CFD) simulations for evaluation of basic geometrical shapes as headers for equal liquid flow distribution. The headers that have been evaluated are conical header, cylindrical header, pyramidal header, rectangular header and spherical header. The computational approach used in the study has been validated by comparing predictions of numerical simulations with experimental results for a cylindrical header. The effects of volume of header, flow rate, diameter of outlets and pressure imbalance at outlets on flow distribution have been studied. At low flow rates, there is no significant difference in the performance of the headers of different geometrical shapes. At higher flow rates, spherical header is found to be better. The possibility of ensuring equal flow distribution by having outlets of varying cross‐sectional area is discussed. The results reported in the study provide useful insights relevant for header design problems. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.

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Computational Fluid Dynamics Modeling of a Bench-scale Pump−Mixer: Head, Power and Residence Time Distribution

Cited by 18 publications

References 39 publications

CFD modeling of pump‐mix action in continuous flow stirred tank

CFD modeling of pump‐mix action in continuous flow stirred tank

Non‐invasive mixing time estimation in unbaffled stirred tank: An ultrasonic approach

Numerical simulations to evaluate basic geometrical shapes as headers for equal liquid flow distribution

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