Hydrodynamic Modeling of Swirling Flow and Particle Classification in                    Large-Scale Hydrocyclones

Rajamani, Raj K.; Devulapalli, Balaji

doi:10.14356/kona.1994016

Cited by 25 publications

(6 citation statements)

References 8 publications

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“…The simulation of the high-turbulent cyclone vortices requires the numerical solution of the basic equations of fluid dynamics combined with an adequate turbulence model. Turbulence effects are often characterized in a simplified manner by using the Prandtl mixing length model (Bloor and Ingham, 1975a,b;Pericleous and Rhodes, 1986;Davidson, 1988;Rajamani, 1988a,b, 1991;Rajamani and Devulapalli, 1994) or empirically modified k--models Roldán-Villasana et al, 1993;Malhotra et al, 1994;Dai et al, 1999;He et al, 1999;Statie et al, 2001Statie et al, , 2002Salcudean et al, 2003;Yang et al 2004). The Prandtl mixing length model relies on the basic assumption of turbulent equilibrium so the simulation results match the real flow conditions in a qualitative manner but there is a lack concerning a quantitative comparison between simulation results and experimental data.…”

Section: Review On Hydrocyclone Design and Simulationmentioning

confidence: 99%

Modeling fluid behavior and droplet interactions during liquid–liquid separation in hydrocyclones

Schütz

Gorbach

Piesche

2009

Chemical Engineering Science

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Section: Review On Hydrocyclone Design and Simulationmentioning

confidence: 99%

Modeling fluid behavior and droplet interactions during liquid–liquid separation in hydrocyclones

Schütz

Gorbach

Piesche

2009

Chemical Engineering Science

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“…The HCS1 vortex finder works differently compared with conventional hydrocyclones. , Gas–liquid–solid movement in the riser occurred by lift forces (operating as a draft tube ) and centrifugal forces. The minimum hydrogen flow rate that transports slurry was found to be 0.24 kg/s at 363 K; above this flow rate, hydrogen produces slurry recirculation by the wall in the hydrocyclone …”

Section: Resultsmentioning

confidence: 98%

Hydrocyclone Settler (HCS) with Internal Hydrogen Injection: Measure of Internal Circulation and Separation Efficiencies of a Three-Phase Flow

Tailleur

Peretti

2020

Ind. Eng. Chem. Res.

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A gas−solid−liquid separator and settler (HCS) was designed and tested in a pilot plant to determine the optimal dimensions and best operating conditions for the new solid alkylation process. The HCS uses a hot hydrogen stream to reduce density and viscosity, vaporize a part of hydrocarbons, and preheat a solid. Different geometries were tested, and underflow and overflow streams were characterized; different calibrated sensors determine the flow pattern, radial and axial velocities, particle size distribution, temperature, and pressure. Separation efficiencies depend upon the inlet slurry flow rate and temperature, cone length, hydrogen flow rate and temperature, solid content, and particle size distributions. The best gas, solid, and liquid separation was observed for a base case set of dimensions and operating conditions that produce less than 20 kHz of vibration at the tail pipe and less than 20 kPa of the delta of pressure in the steady state. Effects of hydrogen are discussed.

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“…Recent studies suggest that the Reynolds Stress Model (RSM) can improve the accuracy of numerical solutions [8][9][10][11]. For hydrocyclones, the presence of air core was difficult to model such that either major simplifying assumptions were necessary, or its presence was simply ignored in earlier models [12][13][14][15]. Recently, Delgadillo and Rajamani [16] and Wang et al [17][18] obtained the flow field distribution and air core shape in a hydrocyclone by the use of the RSM or large-eddy simulation (LES) and volume of fluid (VOF) models.…”

Section: Journal Of Computational Multiphase Flowsmentioning

confidence: 99%

Modelling the Multiphase Flow in Dense Medium Cyclones

Chu

Wang

et al. 2010

The Journal of Computational Multiphase Flows

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Dense medium cyclone (DMC) is widely used in mineral industry to separate solids by density. It is simple in design but the flow pattern within it is complex due to the size and density distributions of the feed and process medium solids, and the turbulent vortex formed. Recently, the so-called combined computational fluid dynamics (CFD) and discrete element method (DEM) (CFD-DEM) was extended from two-phase flow to model the flow in DMCs at the University of New South Wales (UNSW). In the CFD-DEM model, the flow of coal particles is modelled by DEM and that of medium flow by CFD, allowing consideration of medium-coal mutual interaction and particleparticle collisions. In the DEM model, Newton's laws of motion are applied to individual particles, and in the CFD model the local-averaged Navier-Stokes equations combined with the volume of fluid (VOF) and mixture multiphase flow models are solved. The application to the DMC studies requires intensive computational effort. Therefore, various simplified versions have been proposed, corresponding to the approaches such as Lagrangian particle tracking (LPT) method where dilute phase flow is assumed so that the interaction between particles can be ignored, one-way coupling where the effect of particle flow on fluid flow is ignored, and the use of the concept of parcel particles whose properties are empirically determined. In this paper, the previous works on the modelling of DMCs at UNSW are summarized and the features and applicability of the models used are discussed.

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Hydrodynamic Modeling of Swirling Flow and Particle Classification in Large-Scale Hydrocyclones

Cited by 25 publications

References 8 publications

Modeling fluid behavior and droplet interactions during liquid–liquid separation in hydrocyclones

Modeling fluid behavior and droplet interactions during liquid–liquid separation in hydrocyclones

Hydrocyclone Settler (HCS) with Internal Hydrogen Injection: Measure of Internal Circulation and Separation Efficiencies of a Three-Phase Flow

Modelling the Multiphase Flow in Dense Medium Cyclones

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