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1、HindawiPublishingCorporationScienceandTechnologyofNuclearInstallationsVolume2011,ArticleID941239,10pagesdoi:10.1155/2011/941239ResearchArticleCFDModelingofWallSteamCondensation:Two-PhaseFlowApproachversusHomogeneousFlowApproachS.Mimouni,1N.Mechitoua,1A.Foissac,1M.Hassanaly,2andM.Ouraou21Elect
2、ricit´edeFranceR&DDivision,6QuaiWatier,78400ChatouCedex,France2INCKA,85,AvenuePierreGrenier,92100BoulogneBillancourt,FranceCorrespondenceshouldbeaddressedtoS.Mimouni,stephane.mimouni@edf.frReceived14March2011;Revised3May2011;Accepted6May2011AcademicEditor:GiorgioGalassiCopyright©2011S.Mimouni
3、etal.ThisisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense,whichpermitsunrestricteduse,distribution,andreproductioninanymedium,providedtheoriginalworkisproperlycited.Thepresentworkisfocusedonthecondensationheattransferthatplaysadominantroleinmanyaccidentscenariospostul
4、atedtooccurinthecontainmentofnuclearreactors.ThestudycomparesageneralmultiphaseapproachimplementedinNEPTUNECFDwithahomogeneousmodel,ofwidespreaduseforengineeringstudies,implementedinCodeSaturne.ThemodelimplementedinNEPTUNECFDassumesthatliquiddropletsformalongthewallwithinnucleationsites.Vapor
5、condensationondropletsmakesthemgrow.Oncethedropletdiameterreachesacriticalvalue,gravitationalforcescompensatesurfacetensionforceandthendropletsslideoverthewallandformaliquidfilm.Thisapproachallowstakingintoaccountsimultaneouslythemechanicaldriftbetweenthedropletandthegas,theheatandmasstransfer
6、ondropletsinthecoreoftheflowandthecondensation/evaporationphenomenaonthewalls.Asconcernthehomogeneousapproach,themotionoftheliquidfilmduetothegravitationalforcesisneglected,aswellasthevolumeoccupiedbytheliquid.Bothcondensationmodelsandcompressibleproceduresarevalidatedandcomparedtoexperimentald
7、ataprovidedbytheTOSQANISP47experiment(IRSNSaclay).Computationalresultscomparefavorablywithexperimentaldata,particularlyfortheHeliumandsteamvolumefractions.1.IntroductionToevaluatethecondensationmodellingofcontainmentcodes,ISP47testwasperforme
