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1、ProceedingsofICONE14InternationalConferenceonNuclearEngineeringJuly17-20,Miami,Florida,USAICONE14-89158ADVANCESINCOMPUTATIONALFLUIDDYNAMICSMODELINGOFTWO-PHASEFLOWINABOILINGWATERREACTORFUELASSEMBLYAdrianTentnerArgonneNationalLaboratory,Argonne,Illinois,USASimonLoCD-adapco,Lond
2、on,UKAndreyIoilev,VladimirMelnikov,MaskhudSamigulin,VasilyUstinenkoRussianFederalNuclearCenter(VNIIEF),Sarov,RussiaValentinKozlovSarovLaboratories,Sarov,Russia3ABSTRACTFinter-phaseforce,N/m2Anewcode,CFD-BWR[1],isbeingdevelopedfortheggravitationalacceleration,9.806m/ssimulatio
3、noftwo-phaseflowphenomenainsideaBWRfuelhheattransfercoefficient,W/(m2K)bundle.Thesephenomenaincludecoolantphasechangesandhlatentheat,J/kgfgmultipleflowregimeswhichdirectlyinfluencethecoolantinteractionwithfuelassemblyand,ultimately,thereactorJsuperficialvelocity,m/s22performa
4、nce.CFD-BWRisaspecializedmodulebuiltonthekturbulencekineticenergy,m/s3foundationofthecommercialCFDcodeSTAR-CD[2]whichm&masstransferrate,kg/cm3providesgeneraltwo-phaseflowmodelingcapabilities.NewMsumoftheinter-phaseforces,N/m-3modelsdescribingtheinter-phasemass,momentum,andnnu
5、mberofbubblesordropletsinaunitvolume,menergytransferphenomenaspecificforBWRshavebeennvectornormaltothewallwdevelopedandimplementedintheCFD-BWRmodule.Asetppressure,Paofexperimentsfocusedontwo-phaseflowandphase-change3Qinter-phaseheattransfer,W/mphenomenahasbeenidentifiedforthe
6、validationoftheCFD-BWRcodeandresultsoftwoexperimentanalysesfocusedonStStantonnumbertheradialvoiddistributionarepresented.ThecloseagreementEo&&Eötwosnumberbetweenthecomputedresults,themeasureddataandtheRedReynoldsnumbercorrelationresultsprovidesconfidenceintheaccuracyoftheSsur
7、faceareaofbubblesordroplets,m2dmodels.2sdragareaofbubblesordroplets,mdttime,sNOMENCLATURETtemperature,KTsaturationtemperature,KLatinsat2Ainterfacialarea,muvelocityvector,m/s-1Aispecificinterfacialarea,mxdistance,maspecificdragarea,m-1iGreekClginterfacialdragcoefficientαvolume
8、fractionDdiameterofbubblesordroplets,mγvoidfractiondifferenceeintern
