fluent－换热器的相变模拟计算

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

2、esuchprocessthroughuseofadetailedexampleShell-and-tubecondenserProvidemotivationforuserstobegindevelopingmodelsoftheirowndevices2CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.OutlineProblemDescriptionShell-and-tubecondenserPurevaporcondensationNon-condensablegasesMod

3、elingApproachPorousmediumHeatandmasstransfermodelingModelImplementationUser-DefinedFunctionsandUser-DefinedMemoryResultsSteamcondenserwithnon-condensablegasesCommercialchillercondenser3CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.DescriptionofProblemShell-and-tubeco

4、ndenser4CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.GoalsofCFDModelingCondenserperformancecharacterizedbyheatandmasstransferrateCFDallowsevaluationoffactorsaffectingheatandmasstransferincondenserTubebundleconfigurationTubearrangementNumberofpassesLocationofinletpor

5、tsBafflesPressuredropVelocityfieldNon-condensablesLocationandconfigurationofpurgesystemResultsallowidentificationofpotentialdesignimprovements5CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.FilmCondensationProcessDrivingpotentialforcondensationisthetemperaturedifferen

6、cebetweenvaporandcoolingwaterDrivingpotentialvariationcausedbyPressuredropRiseofcoolingwatertemperatureNon-condensablesTPH2OPairCondensatelayerTubewallCoolingwater6CompanyConfidentialCopyright2001FluentInc.Allrightsreserved.CFDModelingTheoryPorousmediumapproachTubebundletreatedasp

7、orousmediumEnablescomputationallyefficientmodelingofentirecondenserComparisonwithdetailedmodelingapproachIn2-D,O(100)-O(1000)controlvolumespertubeversusmorethanonetubepercontrolvolumeHeatandmasstransfermodelsCondensationratecalculationCondensationratedeterminedfromlocalflowfieldan

8、dcoolingwatertemperatureLiquidfil