Heat and Mass Transfer in Porous Media

《Heat and Mass Transfer in Porous Media 》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、HeatandMassTransferinPorousMediaForcedConvectiveDryingof3-DMoistObjects:ExperimentalFacilityandCFD-MassTransferModelingVelocityprofileoveramoistobjectInletIsothermsIsothermatt=500secMoistureContentatt=500secMoistObjectConvectivedryingisaprocessofthermallyremov

2、ingvolatileliquidfrommoistobjectssuchasfoodstuffs,ceramicproducts,clayproducts,woodetc.Wearedevelopinga3DheatandmasstransfermodelwhichwillbecoupledtoaCFDcode.ThismodelwillbeabletopredictthedryingtimerequiredfordifferentReynoldsnumbersandotherdryingconditions.A

3、llkindsofobjectscanbemodeledwithdifferentorientationsandpositions.Thesemoistobjectswillbeplacedinfrontofahotanddrystreamofairtopredictthetransientmoisturecontentandtemperaturedistribution.Anexperimentalfacilitywillbebuilttovalidatethenumericalmodeldeveloped.Ra

4、diationinParticipatingMediaRadiationmodelingwithaheatsourceinthreedimensionalenclosureswithconvectiveboundaryconditionRadiativeheattransferinparticipatingmediaisacomplexphenomenon.Weareusingdiscreteordinatesmethodtosolvetheradiativetransferequations.Wehavemode

5、ledaheatsourceofconicalshapetorepresentaflame.Inthewalls,wehaveconsideredaconvectiveboundaryconditionstorepresentthewaterwallinaboiler.358357356)3552354(W/m353wTemperatureprofilesT352atthewallfor351β=0.5β=1differentextinction350β=2β=5coefficient34900.20.40.60.

6、81HeatgenerationzoneZ(m)representingaflameinacombustionchamberIsothermsinacenterplaneIsothermsinthewaterwallFluidflowandHeatTransferininternalflows:EffectofradiationinaflowthroughaparallelplatechannelNoradiation,onlyRadiationandforcedforcedconvectionconvection

7、withanabsorbing-emittinggasMixedconvectioninatriangularductTheblockstructuredgridusedinthesimulation30Ra=0Ra=2E325HeattransferRa=2E4Ra=1E5enhancement20Ra=2E5becauseofbuoyancyRa=1E6forceshowingwithSeries7z15effectofRayleighNunumberRaonlocalNusseltnumber1052.47l

8、ine00.0010.010.11Z/(RePrDh)ContoursofseconderyvelocityprofileataparticularlocationforRa=1E5showingtheeffectofbuoyancyEnhancementofHeatTransferwithporousinsertsEnhancementofcombined