6533b852fe1ef96bd12aaf2a
RESEARCH PRODUCT
Turbulent heat transfer in spacer-filled channels: Experimental and computational study and selection of turbulence models
Mariagiorgia La CervaMichele CiofaloAlessandro TamburiniMassimiliano Di Libertosubject
Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi Chimici020209 energyLiquid crystal thermographyMembrane distillation02 engineering and technologyHeat transfer coefficientMembrane distillation01 natural sciences010305 fluids & plasmassymbols.namesakeComputational fluid dynamic0103 physical sciencesDigital image processingHeat transfer0202 electrical engineering electronic engineering information engineeringRange (statistics)Overlapped spacerSettore ING-IND/19 - Impianti NucleariRANS turbulence modelPhysicsTurbulenceGeneral EngineeringReynolds numberLaminar flowMechanicsCondensed Matter PhysicsHeat transfersymbolsdescription
Abstract Heat transfer in spacer-filled channels of the kind used in Membrane Distillation was studied in the Reynolds number range 100–2000, encompassing both steady laminar and early-turbulent flow conditions. Experimental data, including distributions of the local heat transfer coefficient h, were obtained by Liquid Crystal Thermography and Digital Image Processing. Alternative turbulence models, both of first order (k-e, RNG k-e, k-ω, BSL k-ω, SST k-ω) and of second order (LRR RS, SSG RS, ω RS, BSL RS), were tested for their ability to predict measured distributions and mean values of h. The best agreement with the experimental results was provided by first-order ω-based models able to resolve the viscous/conductive sublayer, while all other models, and particularly e-based models using wall functions, yielded disappointing predictions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-11-01 |