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1、Lecture5RealGasPropertiesand theIAPWSLibraryCFXMultiphasefortheNuclearIndustryOverviewRealFluidsandEquationsofStateIAPWSEOSMaterialProperties:EOSForrealfluids,propertiescanchangeoverwiderangeof(T,p) fluidpropertiesdependonthermodynamicstateBothliquidandgaspr
2、opertiescanbefunctionsoftemperatureandpressureVolumetricequationsofstatedescribehowthedensitiesandheatcapacitiesvarywithTandP(note:heatcapacitiesalsorequiredataforthebehavioratlowpressures,i.e.idealgasheatcapacities)Dataforvariationoftransportproperties(visco
3、sity,thermalconductivity,etc.)mayalsobeneededEquationofstate(EOS)typesinCFX:IdealGaslawTabulateddata;Realgasproperty(RGP)tablesRedlich-KwongEOSPeng-RobinsonEOSIAPWSEOSUserdefinedequationofstate(CCL,CEL)UserdefinedmaterialsandmaterialpropertiesIAPWSPropertieso
4、fWaterandSteamIAPWS-IF97equation-of-statefirstimplementedinANSYSCFX11.0Reference:W.Wagner,A.Kruse: “TheIndustrialStandardIAPWS-IF97:PropertiesofWaterandSteam”,Springer,Berlin,1998subcooledwatersupercriticalwater/steamsuperheatedsteamsaturationdatahightemperat
5、uresteam(currentlynotimplementedinIAPWSlibraryinCFX,but propertiesathighT,lowPcanbeevaluatedwithIdealGasLaw)IAPWSPropertiesofWaterandSteamLiquidwaterandsteamselectablefromIAPWSdatabaseCFXusesalook-uptableapproachforspeedofcomputationsoanappropriate(T,p)ranges
6、houldbespecifiedandextrapolationorclippingshouldbeselectedforconditionsthatlieoutsidetherangeLibrarycontainsdatafordensity,heatcapacity,thermalconductivity,andviscosityofphasesIAPWSlibraryincludesentryfor“HomogeneousBinaryMixture”for water/steampairsaswell:Ac
7、tsaplaceholderforphasepairrelatedproperties,i.e.Tsat=Tsat(p)and=(T)ExtrapolationandClippingIftablerangevaluesarepoorlychosen,thenpropertiesmaybebasedonclippedorextrapolatedpropertydata,whichcanbebadintermsofbothrobustnessandaccuracySometimestheout-of-rangee
8、rrorsoccurnearthestartoftherun,butgoawayasaconvergedsolutionisapproached.Inothercases,ifthereareconditionsinthesimulationwhichlieoutsidethetablerange,theout-of-rangemessagescanpersistthro
