Search results for "Membrane distillation"

showing 3 items of 53 documents

Water Fluxes in Polymeric Membranes for Desalination via Membrane Distillation

2010

Membrane distillation is an emerging technique for seawater desalination. Hydrophobic polymeric membranes are used to separate the solute‐free water vapour from the hot solution. Vapour fluxes of commercial polymeric membranes were measured in various conditions, i.e. natural and forced convection and vacuum. Vapour fluxes were also predicted with models and compared with experimentals. Higher fluxes were recorded in vacuum conditions.

inorganic chemicalsPhysics::Biological PhysicsSettore ING-IND/24 - Principi Di Ingegneria ChimicaChemistryDiffusiontechnology industry and agriculturemembrane distillationPortable water purificationMembrane distillationDesalinationQuantitative Biology::Cell BehaviorForced convectionPhysics::Fluid DynamicsQuantitative Biology::Subcellular ProcessesdesalinationMembraneChemical engineeringEnvironmental chemistrypolymeric membranebiological scienceshealth occupationsbacteriaPolymeric membranePhysics::Atmospheric and Oceanic PhysicsWater vapor
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Modelling flow and heat transfer in spacer-filled membrane distillation channels using open source CFD code

2013

Abstract A good understanding of the details of hydrodynamic and heat transport conditions and their impact on temperature polarisation and pressure drops is essential for optimum design of membrane distillation (MD) modules. To this end, the present work reports on initial progress in the development of a tool for 3D simulation of spacer-filled MD channels based on the open source CFD code library OpenFOAM. The paper discusses a number of modelling and implementation aspects including model geometry and computational domain, choice of boundary conditions, and discretisation schemes. The results pertaining to the effect of three different spacer types on the fluid dynamics and heat transfer…

spacer-filled channelPressure dropSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciEngineeringWork (thermodynamics)business.industryMechanical EngineeringGeneral Chemical EngineeringFlow (psychology)temperature polarisationMechanical engineeringMembrane distillationGeneral ChemistryComputational fluid dynamicsMembrane distillationHeat transferFluid dynamicsspacerGeneral Materials ScienceBoundary value problemCFDbusinessWater Science and TechnologyDesalination
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Friction and Heat Transfer in Membrane Distillation Channels: An Experimental Study on Conventional and Novel Spacers

2022

The results of an experimental investigation on pressure drop and heat transfer in spacer-filled plane channels, which are representative of Membrane Distillation units, are presented and discussed. Local and mean heat transfer coefficients were obtained by using Thermochromic Liquid Crystals and Digital Image Processing. The performances of a novel spacer geometry, consisting of spheres that are connected by cylindrical rods, and are hereafter named spheres spacers, were compared with those of more conventional woven and overlapped spacers at equal values of the Reynolds number Re (in the range ~150 to ~2500), the pitch-to-channel height ratio, the flow attack angle and the thermal boundar…

spacer-filled channelSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciProcess Chemistry and Technologyheat transferChemical Engineering (miscellaneous)Membrane distillationFiltration and Separationspheres spacermembrane distillation; heat transfer; pressure drop; spacer-filled channel; spheres spacer; thermochromic liquid crystalsthermochromic liquid crystalsSettore ING-IND/19 - Impianti Nuclearipressure dropMembranes
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