Search results for " drag force"

showing 3 items of 3 documents

CFD simulations of dense solid–liquid suspensions in baffled stirred tanks: Prediction of solid particle distribution

2013

Abstract Industrial tanks devoted to the mixing of solid particles into liquids are often operated at an impeller speed N less than Njs (defined as the lowest speed allowing the suspension of all particles): under such conditions the distribution of solid-particles is very far from being homogeneous and very significant concentration gradients exist. The present work is devoted to assessing the capability of Computational Fluid Dynamics (CFD) in predicting the particle distribution throughout the tank. The CFD model proposed by Tamburini et al. [58] and successfully applied to the prediction of the sediment amount and shape was adopted here to simulate the particle distribution under partia…

EngineeringSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSteady statebusiness.industryGeneral Chemical EngineeringSettore ING-IND/25 - Impianti ChimiciMixing (process engineering)Mechanical engineeringGeneral ChemistryMechanicsComputational fluid dynamicsIndustrial and Manufacturing EngineeringRushton turbineImpellerSettore ING-IND/06 - FluidodinamicaEnvironmental ChemistryParticleMulti Fluid Model (MFM) Computational Fluid Dynamics (CFD) turbulence closure solid-liquid suspension partial suspension drag force stirred tank particle distribution Unsuspended Solid Criterion (USC)Suspension (vehicle)businessReynolds-averaged Navier–Stokes equations
researchProduct

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
researchProduct

CFD simulations of dense sloid-liquid suspensions in baffled stirred tanks: Prediction of suspension curves

2011

Mixing of solid particles into liquids within contactors mechanically agitated by stirrers is a topic of primary importance for several industrial applications. A great research effort has been devoted to the assessment of the minimum impeller speed (Njs) able to guarantee the suspension of all particles. Conversely, only little attention has been paid so far to the evaluation of the amount of solid particles that are suspended at impeller speeds lower than Njs. In some cases the loss in available interfacial area between particles and liquid could be reasonably counterbalanced by a decreased mechanical power, making it of interest to evaluate the percentage of suspended solids at different…

EngineeringDrag coefficientEulerian-Eulerian Solid-liquid suspension Partial suspension Drag force Stirred tank Suspension curve Two.phase flow Turbulence modelTurbulencebusiness.industryGeneral Chemical EngineeringSettore ING-IND/25 - Impianti ChimiciMixing (process engineering)Mechanical engineeringGeneral ChemistryMechanicsComputational fluid dynamicsIndustrial and Manufacturing EngineeringImpellerDragEnvironmental ChemistryTwo-phase flowbusinessSuspension (vehicle)
researchProduct