CFX_Multiphase_120_WS05_Interphase_Mass_Transfer_f

WS5-1ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#Workshop5InterphaseMassTransferforMulticomponentFluidsCFXMultiphasefortheNuclearIndustryWS5:InterphaseMassTransferforMulticomponentFluidsWS5-2ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementMulticomponentMassTransferforaSteamJet•Thisexampleshowshowonemaysetupmulticomponentmasstransferusingasourceandsinkapproachwithsubdomains•Itsimulatesthehigh-speedflowofwetsteamintoairwhereitcanmixwithdryairandeithercondenseontoliquiddropletsorevaporateliquidwaterdroplets•Thisexampledemonstrates:–UseoftheIAPWSMaterialLibraryforpropertiesofliquidwaterandsteam–Multicomponentmultiphasemasstransferwithsourcesandsinks–Treatmentoflatentheateffects–UseoflinearizationcoeffcientsforuserdefinedsourcestohelpaidconvergenceWS5:InterphaseMassTransferforMulticomponentFluidsWS5-3ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementImportingtheMesh•Tosavetime,anaxisymmetricmeshwithasingleelementinthethetadirectionwillbeused•StartCFX-Preandcreateanewsimulation(File/NewCase/General).IntheOutline,right-clickonMeshandselectImportMesh/CFXMesh,thenchoosesteam_jet.gtmfromtheinput-filesfolderforthiscourseandclickOpenWS5:InterphaseMassTransferforMulticomponentFluidsWS5-4ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementComputationalMeshWS5:InterphaseMassTransferforMulticomponentFluidsWS5-5ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementCCLFileImportforPredefinedExpressions•Inordertoshortentheset-uptimeforthistutorial,CCLfileswhichsetupexpressionsforvariousparametersfortheinterphasemasstransferaswellasadditionalvariableswhichwillbedefinedforthedomainwillbeimported•FromtheFilemenu,selectImportCCL,enterthesteam_jet_expressions.cclasthefilename(locatedintheinput-filesfolderforthiscourse),andclickOpen.•Thisfiledefinesexpressionsrequiredforsettingupthefollowingdata:–Liquid/gasinterface–Interphasediffusivetransportcoefficient–Heatsofvaporization–Liquid-gasmasstransferforwater–ContinuitylinearizationwithrespecttoP,–LocalfalsesteplinearizationoftheIPMT–TimestepprofileWS5:InterphaseMassTransferforMulticomponentFluidsWS5-6ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementImportedExpressionsWS5:InterphaseMassTransferforMulticomponentFluidsWS5-7ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementCCLFileImportforAdditionalVariables•FromtheFilemenu,selectImportCCL,entersteam_jet_additional_variables.cclasthefilename(locatedintheinput-filesfolderforthiscourse),andclickOpen.•Thisfiledefinesthefollowingadditionalvariables:–PressurelinearizationcoefficientPCoef–WaterIPMTfluxliquidtogasWaFluxLG–WaterIPMTfluxgastoliquidWaFluxGL–LocalIPMTfalsetimestepFalseDt–Saturationtemperatureforpostprocessing,SatTemp–Saturationpressureforpostprocessing,SatPres–Latentheatatsaturationforpostprocessing,SatLHeatWS5:InterphaseMassTransferforMulticomponentFluidsWS5-8ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementLoadingMaterialsfromtheIAPWSLibrary•IntheOutline,right-clickonMaterialsandselectImportLibraryData.•ClickthebrowsebuttonnexttoFiletoImport.•TheImportCCLdialogboxappears.•UnderImportMethod,selectAppend.ThisoptionsappendstheCCLchangestotheexistingcase.•SelectMATERIALS-iapws.cclfromtheetc/materials-extradirectoryandclickOpen.•IntheSelectLibraryDatatoImportdialogbox,expandWetSteamandselectSteam3vl.•ClickOK.•IntheOutlinetreeview,expandMaterialstoconfirmthatSteam3l,Steam3v,andSteam3vlhavebeenaddedtothelist.WS5:InterphaseMassTransferforMulticomponentFluidsWS5-9ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementDefiningaVariableCompositionMixture(Gas)•Right-clickonMaterialsandselectInsert/Material•Namethenewmaterial:Gasmixture•OntheBasicSettingstab,settheOptiontoVariableCompositionMixtureandselectAirIdealGasandSteam3vasthetwocomponentsintheMaterialsList(holdtheCTRLkeydowntopermitmultipleselections)•ClickOKtocreatethemixtureWS5:InterphaseMassTransferforMulticomponentFluidsWS5-10ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementDefiningaFixedCompositionMixture(Liquid)•Right-clickonMaterialsandselectInsert/Material•Namethenewmaterial:Liquidmixture•OntheBasicSettingstab,settheOptiontoFixedCompositionMixtureandSteam3lasthesinglecomponentintheMaterialsList•SettheMassFractionforSteam3lto1.0•ClickOKtocreatethemixture•ThissimulationwillmodeltransferofmassfromapureliquidphasetoagasphasecontainingairandwatervaporwhichiswhythetwomaterialshavebeencreatedasspecifiedWS5:InterphaseMassTransferforMulticomponentFluidsWS5-11ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementFluidDefinition:Gas•EdittheDefaultDomain•OntheBasicSettingstab.highlightFluidDefinition1andd