Search results for " Hollow fiber membrane"

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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A parametric CFD study of hollow fiber membrane modules for hemodialysis

2022

Hemodialysis is a membrane-based process in which solute transport from the patient’s blood to a rinsing solution (dialysate) occurs by diffusion and ultrafiltration. Devices used in hemodialysis are cylindrical modules filled with hollow-fiber membranes which allow the removal of toxic substances and metabolic wastes from the blood, but inhibit the passage of proteins and cells to the dialysate. A predictive porous-media model of hemodialysis was developed and validated against experimental data. Unlike previous literature models, it requires only basic membrane properties (hydraulic and diffusive permeabilities and reflection coefficients) instead of relying on empirically adjusted global…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/25 - Impianti ChimiciComputational fluid dynamics Hemodialysis Hollow fiber membrane Mass transfer Porous mediaSettore ING-IND/19 - Impianti Nucleari
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A porous media CFD model for the simulation of hemodialysis in hollow fiber membrane modules

2022

A computational model was developed to predict the performance of hollow fiber membrane hemodialyzers. Blood and dialysate were modelled as fluids flowing through two interpenetrating porous media. Concerning hydrodynamics, experimental Darcy permeabilities measured for commercial hemodialyzers were used for both compartments. Concerning mass transfer, both diffusion and ultrafiltration were simulated. On the blood side theoretical Sherwood numbers for parallel flow in pipes were adopted. On the dialysate side Sherwood numbers were derived from CFD predictions for regular hexagonal fiber bundles. Solute concentrations on the two sides were alternatively computed in an iterative way and were…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/25 - Impianti ChimiciHemodialysisComputational fluid dynamics Hemodialysis Hollow fiber membrane Mass transfer Porous mediaPorous mediaMass transferFiltration and SeparationGeneral Materials ScienceComputational fluid dynamicsPhysical and Theoretical ChemistryBiochemistrySettore ING-IND/19 - Impianti NucleariHollow fiber membraneJournal of Membrane Science
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