Search results for " Multiphase Flow"

showing 4 items of 4 documents

On the Simulation of Solid Particle Distribution in Multiple Impeller Agitated Tanks via Computational Fluid Dynamics

1998

CFD Stirred Tank Multiple Impeller Turbulence Solid-Liquid Flow Multiphase FlowSettore ING-IND/19 - Impianti Nucleari
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Influence of drag and turbulence modelling on CFD predictions of solid liquid suspensions in stirred vessels

2014

Abstract Suspensions of solid particles into liquids within industrial stirred tanks are frequently carried out at an impeller speed lower than the minimum required for complete suspension conditions. This choice allows power savings which usually overcome the drawback of a smaller particle-liquid interfacial area. Despite this attractive economical perspective, only limited attention has been paid so far to the modelling of the partial suspension regime. In the present work two different baffled tanks stirred by Rushton turbines were simulated by employing the Eulerian-Eulerian Multi Fluid Model (MFM) along with either the Sliding Grid algorithm (transient simulations) or the Multiple Refe…

Computational Fluid Dynamics (CFD)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciEngineeringWork (thermodynamics)Steady statebusiness.industryTurbulenceSettore ING-IND/25 - Impianti ChimiciGeneral Chemical EngineeringMultiphase flowTurbulence modelGeneral ChemistryMechanicsComputational fluid dynamicsImpellerStirred tankDragControl theorySettore ING-IND/06 - FluidodinamicaSolid liquid suspensionMultiphase flowSuspension (vehicle)businessComputational Fluid Dynamics (CFD); Stirred tank; Solid liquid suspension; Drag force; Turbulence model; Multiphase flowDrag forceChemical Engineering Research and Design
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On the bubbling dynamics of binary mixtures of powders in 2D gas-solid fluidized beds

2012

Abstract The bubbling behavior of fluidized beds has been thoroughly investigated in the last decades by means of several techniques (e.g. X-ray, Inductance, Resistance and Impedance based techniques). In recent years, Digital Image Analysis Techniques have shown their potential for accurate and cost effective measurements. Most of the works related to the experimental analysis of bubble behavior in the field of gas-solid fluidization actually deal with monodispersed particles although almost all industrial equipments operate with mixtures of particles. Among the works available in literature dealing with mixtures of particles having different diameters and/or densities, most of them aim at…

Work (thermodynamics)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciMaterials scienceSteady stateFluidized bed Multiphase flow Bubbles Imaging Binary mixtureBUBBLESGeneral Chemical EngineeringBubbleMultiphase flowMixing (process engineering)Binary numberThermodynamicsBINARY MIXTURESMechanicsPhysics::Fluid DynamicsFluidized bedFluidizationMultiphase flowBubbling fluidized bed
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EXPERIMENTAL INVESTIGATION OF DILUTE SOLID-LIQUID SUSPENSION IN AN UNBAFFLED STIRRED VESSELS BY A NOVEL PULSED LASER BASED IMAGE ANALYSIS TECHNIQUE

2009

The availability of experimental information on solid distribution inside stirred tanks is a topic of great importance in several industrial applications. The measurement of solid particle distribution in turbulent multiphase flow is not simple and the development of suitable measurement techniques is still in progress. In this work a novel non-intrusive technique for measuring particle concentration fields in solid-liquid systems is employed. The technique makes use of a laser sheet, a high sensitivity digital camera for image acquisition and a Matlab procedure for post-processing the acquired images. Experimental data are here obtained for the case of an unbaffled stirred tank. Stable tor…

lcsh:Computer engineering. Computer hardwareSettore ING-IND/25 - Impianti Chimicilcsh:TP155-156lcsh:TK7885-7895lcsh:Chemical engineeringThe availability of experimental information on solid distribution inside stirred tanks is a topic of great importance in several industrial applications. The measurement of solid particle distribution in turbulent multiphase flow is not simple and the development of suitable measurement techniques is still in progress. In this work a novel non-intrusive technique for measuring particle concentration fields in solid-liquid systems is employed. The technique makes use of a laser sheet a high sensitivity digital camera for image acquisition and a Matlab procedure for post-processing the acquired images. Experimental data are here obtained for the case of an unbaffled stirred tank. Stable toroidal attractors for particles are observed under given circumstances. Their existence consistency and extension depends on particle type fluid properties tank geometry and impeller velocity.Chemical Engineering Transactions
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