Search results for "Contactor"

showing 2 items of 12 documents

CFD simulations of dense solid–liquid suspensions in baffled stirred tanks: Prediction of the minimum impeller speed for complete suspension

2012

Abstract In the literature on mechanically agitated solid–liquid systems, several methods are described to estimate the minimum impeller speed Njs at which all particles are suspended, but few studies have been devoted so far to their critical comparative assessment [67] . In the present paper, several alternative Njs prediction methods are applied to CFD results obtained for selected test cases covering a broad range of suspension conditions and impeller speeds. Results are compared with one another and with classic empirical correlations [88] . The aim of the work is to assess the adequacy of different methods for predicting Njs and, more generally, to contribute to a viable CFD-based str…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciWork (thermodynamics)Engineeringbusiness.industrySettore ING-IND/25 - Impianti ChimiciGeneral Chemical EngineeringMixing (process engineering)Mechanical engineeringGeneral ChemistryMechanicsStirred tank Multi-fluid model Computational fluid dynamics Solid–liquid two-phase flow Complete suspension speed Sufficient suspension speed Unsuspended solids criterionComputational fluid dynamicsIndustrial and Manufacturing EngineeringControl volumeImpellerEnvironmental ChemistrySuspension (vehicle)Reynolds-averaged Navier–Stokes equationsbusinessContactorChemical Engineering Journal
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On the measurement of local gas hold-up, interfacial area and bubble size distribution in gas–liquid contactors via light sheet and image analysis: I…

2013

Abstract In this work a novel experimental technique for measuring local gas hold-up, interfacial area and bubble size distribution, in gas–liquid systems is proposed. The technique is based on advanced Image Processing coupled with experimental set-ups typically available for Particle Image Velocimetry. A fluorescent dye dissolved in the liquid phase allows to identify in-plane bubbles among all visible bubbles in the images. To this end, a suitable algorithm is proposed. The raw data so obtained are processed by previously developed statistical methods that result in a reliable reconstruction of actual dispersion properties. The technique is applied to the case of a gas-dispersed mechanic…

Work (thermodynamics)Materials scienceSettore ING-IND/25 - Impianti ChimiciGeneral Chemical EngineeringBubbleMixing (process engineering)Image processingIndustrial and Manufacturing EngineeringImagingPhysics::Fluid DynamicsOpticsGas-liquid dispersionContactorBubblebusiness.industryBUBBLESApplied MathematicsMIXINGMultiphase flowBUBBLE SIZE DISTRIBUTIONGeneral ChemistryMechanicsGas–liquid dispersionParticle image velocimetryMultiphase flowDispersion (chemistry)business
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