Search results for " Mass transfer coefficient"

showing 3 items of 3 documents

Influence of bundle porosity on shell-side hydrodynamics and mass transfer in regular fiber arrays: A computational study

2023

CFD predictions of the effects of a fiber bundle porosity on shell-side hydrodynamics and mass transfer under conditions of steady laminar flow were obtained. Fluid was assumed to flow around regular hexag-onal or square arrays of cylindrical fibers of different pitch to diameter ratios, yielding bundle porosities ranging from the theoretical minimum up to similar to 1. A large number of axial, transverse and mixed flow combinations were simulated by letting the axial and transverse flow Reynolds numbers and the trans-verse flow attack angle vary. Both fully developed and developing conditions (entrance effects) were con-sidered. The continuity and momentum equations, along with a transport…

Fluid Flow and Transfer ProcessesComputational Fluid Dynamics Hollow fiber membrane Entrance effects Darcy permeability Mass transfer coefficient HemodialysisSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciMass transfer coefficientHemodialysisSettore ING-IND/25 - Impianti ChimiciMechanical EngineeringEntrance effectsComputational Fluid DynamicsCondensed Matter PhysicsDarcy permeabilitySettore ING-IND/19 - Impianti NucleariHollow fiber membraneInternational Journal of Heat and Mass Transfer
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Mass transfer and hydrodynamic characteristics of unbaffled stirred bio-reactors: Influence of impeller design

2014

Abstract Unbaffled stirred tanks are increasingly recognized as a viable alternative to common baffled tanks for a range of processes where the presence of baffles is undesirable for some reason. For instance, in the case of shear sensitive cell cultivation (e.g. human cells), unbaffled tanks have been recently found to be able to provide sufficient mass transfer through the free surface vortex. As a consequence the need for bubble formation and subsequent bursting, along with relevant cells damage, is conveniently avoided. In this work the influence of impeller geometry on mass transfer performance and power demand of an unbaffled stirred vessel operating both in sub-critical conditions (t…

Mass transfer coefficientEngineeringEnvironmental EngineeringMass transfer coefficientbusiness.industrySettore ING-IND/25 - Impianti ChimiciMIXINGBiomedical EngineeringMixing (process engineering)Mechanical engineeringBioengineeringBaffleMechanicsMultiphase bioreactorVortexMixing Multiphase reactors Unbaffled tanks Mass transfer coefficient kLa Bioreactors Animal cell cultureImpellerFree surfaceMass transferLiquid bubblebusinessBiotechnologyAnimal cell culture
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Gas-liquid-solid Operation of a High Aspect Ratio Self-ingesting Reactor

2012

Gas-liquid stirred vessels are widely employed to carry out chemical reactions involving a gas reagent and a liquid phase. The usual way for introducing the gas stream into the liquid phase is through suitable distributors placed below the impeller. An interesting alternative is that of using “self ingesting” vessels where the headspace gas phase is injected and dispersed into the vessel through suitable surface vortices. In this work the performance of a Long Draft Tube Self-ingesting Reactor (LDTSR) dealing with three-phase (gas-liquid-solid) systems, is investigated. Preliminary experimental results on the effectiveness of this contactor for particle suspension and gas-liquid mass transf…

Mass transfer coefficientMaterials scienceMass transfer coefficientAspect ratioGeneral Chemical EngineeringSettore ING-IND/25 - Impianti ChimiciSelf inducingLiquid solidGas-liquid-solid reactors stirred vessels self inducing kLa mass transfer coefficient simplified dynamic pressure methodPhysics::Fluid DynamicskLaGas-liquid-solid reactorStirred vesselsComposite material
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