CFD simulations of gas–liquid–solid stirred reactor: Prediction of critical impeller speed for solid suspension

Murthy, B.N.; Ghadge, Rajaram; Joshi, J. B.

doi:10.1016/j.ces.2007.07.005

Cited by 151 publications

(100 citation statements)

References 18 publications

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“…The latter paper also estimated the value of the Basset history force and proposed that the Basset force could be neglected in comparison with the drag force. In the literature, forces other than the drag force are usually ignored for the sake of simplicity (Murthy et al, 2007;Tamburini et al, 2011).…”

Section: Reynolds Averaged Navier-stokes Simulationmentioning

confidence: 99%

“…Thus, the "mixture" model has been widely utilized (Khopkar et al, 2006;Kasat et al, 2008;Tamburini et al, 2009). The "dispersed" model solves the k and ε equations only for the continuous phase, and the effect of the discrete phase on the continuous phase and predictions of the turbulence quantities for the discrete phase are included with source terms (Wang et al, 2004a;Murthy et al, 2007;Feng et al, 2012).…”

Section: Reynolds Averaged Navier-stokes Simulationmentioning

confidence: 99%

“…For a baffled tank agitated by a standard Rushton turbine, the center of the bottom of the tank is the above-mentioned critical position. Murthy et al (2007) predicted the N js by using the standard deviation of solids concentration in a vertical plane and considered the critical value for the normalized standard deviation as 0.75. This value is valid for different impeller designs and is applicable over a wide range of particle sizes and solids loadings.…”

Section: Just-suspended Speedmentioning

confidence: 99%

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Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks

Derksen

Gao

2015

J. Chem. Eng. Japan / JCEJ

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Solid-liquid suspensions in stirred tanks are common unit operations in many process industries. The complex ow characteristics of these systems, such as two-phase turbulence and interphase interaction, make the corresponding numerical simulations complicated and challenging. This paper presents a review of models dealing with the continuous and discrete phases of solid-liquid suspensions and summarizes the applications for simulating related ow phenomena, including velocity and turbulence components, solids concentration, just-suspended speed, cloud height, optimization of geometrical parameters, and particle shape and type. Perspectives concerning di erent modeling approaches are presented, and the Eulerian-Lagrangian approach with resolved particles is highlighted to address the underlying suspension mechanisms in stirred tanks.

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Section: Reynolds Averaged Navier-stokes Simulationmentioning

confidence: 99%

Section: Reynolds Averaged Navier-stokes Simulationmentioning

confidence: 99%

Section: Just-suspended Speedmentioning

confidence: 99%

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Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks

Derksen

Gao

2015

J. Chem. Eng. Japan / JCEJ

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“…In the published literature, the knowledge of flow pattern has been employed for the estimation of equipment performance such as mixing (Joshi and Sharma [62], Joshi [63], Ranade and Joshi [64], Ranade et al [65], and Kumaresan and Joshi [66]), heat transfer (Joshi et al [67], Dhotre and Joshi [68]), Sparger design (Dhotre et al [69], Kulkarni et al [70]), gas induction (Joshi and Sharma [71], Murthy et al [72]), and solid suspension (Raghava Rao et al [73], Rewatkar et al [74], and Murthy et al [75]). Joshi and Ranade [76] have discussed the perspective of computational fluid dynamics (CFD) in designing process equipment with their views on expectations, current status, and path forward.…”

Section: Preamblementioning

confidence: 99%

Large Eddy Simulation for Dispersed Bubbly Flows: A Review

Dhotre

Deen

Ničeno

et al. 2013

International Journal of Chemical Engineering

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Large eddy simulations (LES) of dispersed gas-liquid flows for the prediction of flow patterns and its applications have been reviewed. The published literature in the last ten years has been analysed on a coherent basis, and the present status has been brought out for the LES Euler-Euler and Euler-Lagrange approaches. Finally, recommendations for the use of LES in dispersed gas liquid flows have been made.

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“…The pressure field is assumed to be shared by all the phases according to their volume fraction. The governing equations for any phase q in turbulent flow regime are given as [8] [9]:…”

Section: Conservation Equations Of Multiphase Flowmentioning

confidence: 99%

Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation

Dagadu¹,

Stęgowski²,

Furman³

et al. 2014

JAMP

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Experimental residence time distribution (RTD) measurement and computational fluid dynamics (CFD) simulation are the best methods to study the hydrodynamics of process flow systems. However, CFD approach leads to better understanding of the flow structure and extent of mixing in stirred tanks. In the present study, CFD models were used to simulate the flow in an industrial gold leaching tank. The objective of the investigation was to characterize the flowfield generated within the tank after process intensification. The flow was simulated using an Eulerian-Eulerian multi-fluid model where the RANS standard -ε mixture model and a multiple reference frame approach were used to model turbulence and impeller rotation respectively. The simulated flowfield was found to be in agreement with the flow pattern of pitched blade axial-flow impellers that was used for mixing. The leaching tank exhibited good "off-bottom suspension" which reveals minimum deposition of gold ore particles on the bottom of the leaching tanks. Simulation results were consistent with experimental results obtained from a radioactive tracer investigation. CFD approach gave a better description of the flow structure and extent of mixing in a leaching tank. Hence it could be a preferred approach for flow system analysis where the cost of experimentation is high.

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CFD simulations of gas–liquid–solid stirred reactor: Prediction of critical impeller speed for solid suspension

Cited by 151 publications

References 18 publications

Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks

Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks

Large Eddy Simulation for Dispersed Bubbly Flows: A Review

Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation

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CFD simulations of gas–liquid–solid stirred reactor: Prediction of critical impeller speed for solid suspension

Cited by 151 publications

References 18 publications

Models and Applications for Simulating Turbulent Solid&#x2013;Liquid Suspensions in Stirred Tanks

Models and Applications for Simulating Turbulent Solid&#x2013;Liquid Suspensions in Stirred Tanks

Large Eddy Simulation for Dispersed Bubbly Flows: A Review

Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation

Contact Info

Product

Resources

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Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks

Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks