0000000000726492

AUTHOR

Francesco Nicolò Ponzio

showing 2 related works from this author

Unsteadiness and transition to turbulence in woven spacer filled channels for Membrane Distillation

2017

To characterize the performance of Membrane Distillation (MD) modules, channels filled with woven spacers were investigated by Computational Fluid Dynamics (including Direct Numerical Simulations and the use of the SST k-ω turbulence model) and by parallel experiments with Thermochromic Liquid Crystals. The cases considered here regard mutually orthogonal filaments with a spacer pitch to channel height ratio P/H=2, two spacer orientations θ with respect to the main flow (0° and 45°), and bulk Reynolds numbers Re from ∼200 to ∼2000, an interval of great interest in practical MD applications. For both values of θ, CFD predicted steady-state flow for Re up to ∼300, and chaotic flow …

HistoryFlow (psychology)Thermodynamics02 engineering and technologyComputational fluid dynamicsEducationPhysics::Fluid Dynamicssymbols.namesake020401 chemical engineeringLiquid crystal0204 chemical engineeringbusiness.industryTurbulenceChemistryOscillationSpacer-filled channels CFD membrane distillation turbulence RANS DNSReynolds numberMechanics021001 nanoscience & nanotechnologyComputer Science ApplicationsHeat transfersymbols0210 nano-technologyReynolds-averaged Navier–Stokes equationsbusiness
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Experimental and computational investigation of heat transfer in channels filled by woven spacers

2017

Abstract Models of woven-type spacer-filled channels were investigated by Computational Fluid Dynamics (CFD) and parallel experiments in order to characterize the performance of Membrane Distillation (MD) modules. The case of overlapped spacers was analysed in a companion paper. Experiments were based on a non-intrusive technique using Thermochromic Liquid Crystals (TLC) and digital image processing, and provided the distribution of the local convective heat transfer coefficient on a thermally active wall. CFD simulations ranged from steady-state conditions to unsteady and early turbulent flow, covering a Reynolds number interval of great practical interest in real MD applications. A specif…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciMaterials scienceSettore ING-IND/25 - Impianti ChimiciComputational Fluid Dynamics; Digital image processing; Membrane Distillation; Thermochromic Liquid Crystals; Woven spacerFlow (psychology)02 engineering and technologyHeat transfer coefficientComputational fluid dynamicsComputational Fluid Dynamicsymbols.namesake020401 chemical engineeringDigital image processing0204 chemical engineeringMembrane DistillationWoven spacerFluid Flow and Transfer ProcessesSettore ING-IND/24 - Principi Di Ingegneria ChimicaThermochromic Liquid CrystalTurbulencebusiness.industryMechanical EngineeringReynolds numberMechanics021001 nanoscience & nanotechnologyCondensed Matter PhysicsAspect ratio (image)Heat transfersymbols0210 nano-technologybusinessDigital image processing
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