FLuent-换热器的相变模拟计算.ppt

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1、NewInitiativesatFluentInc.PhaseChangeinHeatExchangersBrianBell,FluentInc.UGM20011CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.MotivationDemonstratetheuseofFluenttomodelphasechangeinheatexchangersProcessesofinterestCondensationEvaporationBoilingI

2、llustratehowtomodelonesuchprocessthroughuseofadetailedexampleShell-and-tubecondenserProvidemotivationforuserstobegindevelopingmodelsoftheirowndevices2CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.OutlineProblemDescriptionShell-and-tubecondenserPu

3、revaporcondensationNon-condensablegasesModelingApproachPorousmediumHeatandmasstransfermodelingModelImplementationUser-DefinedFunctionsandUser-DefinedMemoryResultsSteamcondenserwithnon-condensablegasesCommercialchillercondenser3CompanyConfidentialCopyright2001F

4、luentInc.Allrightsreserved.DescriptionofProblemShell-and-tubecondenser4CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.GoalsofCFDModelingCondenserperformancecharacterizedbyheatandmasstransferrateCFDallowsevaluationoffactorsaffectingheatandmasstrans

5、ferincondenserTubebundleconfigurationTubearrangementNumberofpassesLocationofinletportsBafflesPressuredropVelocityfieldNon-condensablesLocationandconfigurationofpurgesystemResultsallowidentificationofpotentialdesignimprovements5CompanyConfidentialCopyright2001F

6、luentInc.Allrightsreserved.FilmCondensationProcessDrivingpotentialforcondensationisthetemperaturedifferencebetweenvaporandcoolingwaterDrivingpotentialvariationcausedbyPressuredropRiseofcoolingwatertemperatureNon-condensablesTPH2OPairCondensatelayerTubewallCool

7、ingwater6CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.CFDModelingTheoryPorousmediumapproachTubebundletreatedasporousmediumEnablescomputationallyefficientmodelingofentirecondenserComparisonwithdetailedmodelingapproachIn2-D,O(100)-O(1000)controlvo

8、lumespertubeversusmorethanonetubepercontrolvolumeHeatandmasstransfermodelsCondensationratecalculationCondensationratedeterminedfromlocalflowfieldandcoolingwatertemperatureLiquidfil