Search results for " Partial suspension"

showing 2 items of 2 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
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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)
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