CFD modeling of pilot-scale pump-mixer: Single-phase head and power characteristics

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

doi:10.1016/j.ces.2006.10.028

Cited by 37 publications

(28 citation statements)

References 32 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%

“…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%

“…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%

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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%

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

et al. 2007

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“…Examination of such an internal flow of the impeller as surveyed below enables consideration of the energy conversion upon contact with the impeller blades between the agitator shaft and liquid within the vessel. This provides a guideline for modification and design of blade geometries when the conventional design of the impeller requires improved performance, such as an energysaving turbine agitator (Rao and Sivashanmugam, 2010), a top shrouded turbine with trapezoidal blades (Singh et al, 2007) and impellers with blades of different shapes and numbers (Ameur and Bouzit, 2012).…”

Section: Introductionmentioning

confidence: 99%

Liquid Flow in Impeller Swept Regions of Baffled and Unbaffled Vessels With a Turbine-Type Agitator

Yoshida

Ebina

Shirosaki

et al. 2015

Braz. J. Chem. Eng.

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-Liquid flow in the impeller swept region of vessels with a turbine-type agitator was examined for the flow path between the neighboring blades of the rotating impeller. Visualization of the flow and its measurement were done using particle tracking velocimetry with a camera rotating along with the impeller. Internal liquid flow of the impeller differed when the velocity magnitudes were compared in conditions with and without baffles. Larger circumferential and radial velocities were observed without the baffles and with the baffles, respectively, which was considered to result in the difference of impeller power transmission. Efficiencies produced, based on the flow-head concept, reflected the impeller power characteristics. The turbine-type impeller as an actuator was demonstrated to improve in the flow characteristics with viscous losses increased by the baffles. In terms of impeller efficiencies based on the power consumption, the effect of baffles for the energy was as a decreased transmission and an increased transport.

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“…tomotive [3], ventilation [4], power generation, chemical manufacturing [5], petroleum exploration [6] and others. This demonstrates the importance of turbomachines optimal design which should be based on a realistic flow simulation.…”

Section: Introductionmentioning

confidence: 99%

Efficient Rotating Frame Simulation in Turbomachinery

Remaki

Ramezani

Ilzarbe

et al. 2014

Volume 2B: Turbomachinery

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This paper deals with the simulation of steady flows in turbomachinery. Two approaches are proposed, the first one is the classical multiple-rotating frame method (MRF) by multizone approach where the different zones are separated by nonoverlapping interfaces and solved independently. Since each zone is loaded separately, a transferring system should be properly implemented at the interface boundaries. Two techniques are considered, in the first one the conservative variables are interpolated between zones while in the second one the fluxes are transferred through the interfaces.The other proposed approach is a new version of the MRF using a virtual interface (VMRF). This is a simplified of the previous one where the interfaces are created virtually at the solver level, rendering the method easy to implement especially for edge-based numerical schemes, and avoiding any re-meshing in case one needs to change interface position, shape or simply remove or add new one. Finally, numerical tests are performed to demonstrate the efficiency of the proposed methods by comparison with commercial codes (ANSYS FLUENT).

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CFD modeling of pilot-scale pump-mixer: Single-phase head and power characteristics

Cited by 37 publications

References 32 publications

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

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

Liquid Flow in Impeller Swept Regions of Baffled and Unbaffled Vessels With a Turbine-Type Agitator

Efficient Rotating Frame Simulation in Turbomachinery

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