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1、InternationalJournalofHeatandMassTransfer53(2010)4629–4637ContentslistsavailableatScienceDirectInternationalJournalofHeatandMassTransferjournalhomepage:www.elsevier.com/locate/ijhmtModelingtheroleofmicrostructuralparametersinradiativeheattransferthroug
2、hdisorderedfibrousmediaaa,*abM.A.Tahir,H.VahediTafreshi,S.A.Hosseini,B.PourdeyhimiaMechanicalEngineeringDepartment,VirginiaCommonwealthUniversity,Richmond,VA23284-3015,UnitedStatesbNonwovensCooperativeResearchCenter,TheNonwovensInstitute,NCStateUniversi
3、ty,Raleigh,NC27695-8301,UnitedStatesarticleinfoabstractArticlehistory:Understandingtheinfluenceofmicrostructuralparametersontherateofheattransferthroughadisor-Received11December2009deredfibrousmediumisimportantforthedesignanddevelopmentofheatinsulationma
4、terials.InthisReceivedinrevisedform26May2010work,bygeneratingvirtual3-Dgeometriesthatresembletheinternalmicrostructureoffibrousinsula-Accepted26May2010tionmaterials,wesimulatedtheinfluenceofdiameter,orientation,andemissivityofthefibers,aswellAvailableonli
5、ne14July2010asthemedia’sporosityandthicknessontheradiativeheattransmittance.OursimulationsarebasedonaMonteCarloraytracingalgorithmthatwehavedevelopedforstudyingradiativeheatflowin3-DKeywords:disorderedmedia.Themediawereassumedtobemadeupofcylindricalopaq
6、uefiberswithspecularsur-Raytracingface.Theadvantageofourmodelingapproachisthatitdoesnotrequireanyempiricalinputvalues,andFibrousmediaInsulationmaterialscandirectlybeusedtoisolateandstudytheroleofindividualmicrostructuralparametersofthemedia.Radiationmod
7、elingThemajorlimitationofthemodelisthatitisaccurateaslongasthefiberscanbeconsideredlargerel-ativetothewavelengthoftheincomingrays.Ourresultsindicatethatheatfluxthroughafibrousmed-iumdecreasesbyincreasingthepackingfractionofthefiberswhenthethicknessandfiberd
8、iameterarekeptconstant.Increasingthefibers’absorptivity(oremissivity)wasobservedtodecreasetheradiationtransmittancethroughthemedia.Oursimulationsalsorevealedthatforconstantporosityandthickness,theheatfluxtransmittedacrossthemediumcanbered
