Title of article
Analysisofexperimentsforin-tubesteamcondensationinthepresenceofnoncondensablegasesatalowpressureusingtheRELAP5/MOD3.2codemodifiedwithanon-iterativecondensationmodelOriginalResearchArticle
Author/Authors
HyunSikPark، نويسنده , , HeeCheonNO، نويسنده , , YoungSeokBang، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
18
From page
173
To page
190
Abstract
ThestandardRELAP5/MOD3.2codeismodifiedusingnon-iterativemodeling,whichisamechanisticmodeldevelopedforeasyengineeringapplicationtosimulatesteamcondensationinthepresenceofnoncondensablegasesinatube.Topredicttheliquid-sideheattransfercoefficientsinthemodifiedRELAP5/MOD3.2code,Nusselt’scorrelationisusedforthecondensationinaverticaltubeandKim’scorrelation,correlatedwiththeFroudenumberisusedforthecondensationinahorizontaltube.Inthemodifiedcode,thewallfrictioninaverticaltubeiscalculatedusingthetwo-phasefrictionfactorcorrelationproposedbyCollierandtheinterfacialfrictionfactoriscalculatedusingtheempiricalpower-lawrelationshipofChoi.BoththestandardandthemodifiedRELAP5/MOD3.2codesareusedtosimulatetwokindsofverticalin-tubeexperimentsandahorizontallystratifiedin-tubeexperimentinvolvingthecondensationphenomenoninthepresenceofnoncondensablegases.Twoverticalin-tubeexperiments,PassiveContainmentCoolingSystem(PCCS)condensationandrefluxcondensationexperiments,providedataonthesteady-statebehaviorswithatypicalflow,pressureandairmassfractionconditionslikelytobeseeninacondensingtubeofPCCSandinaU-tubeofasteamgeneratorinamid-loopoperation.Thehorizontallystratifiedin-tubeexperimentrepresentsthedirect-contactcondensationphenomenainahotlegofanuclearreactor.ThemodelingcapabilitiesofthemodifiedcodeaswellasthestandardcodeforsteamcondensationinthepresenceofnoncondensablegasesareassessedusingthesethreeKAISTcondensationexperiments.Themodifiedcodegivesabetterpredictionforthedataofthethreecondensationexperimentsthanthatofthestandardcode.SimulationresultsofPCCSandrefluxcondensationexperimentsshowthatthelocalheattransfercoefficientsarepredictedwellwiththemodifiedcodebutinthestandardversionofthecodetheyareunder-predictedbythedefaultmodelandover-predictedbythealternativemodel.Themodifiedcodepredictswelltheexperimentalvoidfractionusingthetwo-phasewallfrictionfactorcorrelation.Simulationresultsofthehorizontallystratifiedcondensationexperimentsshowthatthemodifiedcodepredictstheinterfacialheattransfercoefficientbetterthanthatofthestandardcode.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2003
Journal title
Nuclear Engineering and Design Eslah
Record number
894605
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