Heattransferintwo-componentinternalmistcooling:PartII.MechanisticmodelingOriginalResearchArticle

Thepredictionofamechanistic,three-dimensional,two-phaseflowmodeliscomparedwithexperimentalheattransferdatapresentedintheexperimentalpartofthisstudyforsteady,internal,nozzle-generated,gas/liquidmistflowinverticalchannels.ThemechanisticmodelisbasedonthemodificationoftheKIVA-3Vcomputercode.TheKIVA-3Vcodehasbeenmodifiedtosolvetheheatconductionequationinthesurroundingstructurewitheithersteadyorpulsedheatgenerationsimultaneouslywiththefluidtransportequations,andallowmodelingofthevariouschannelgeometriesanddropletinjectionmethods.Amongthenumericallyexaminedoperatinganddesignparametersare:theliquidatomizationnozzledesign,heatflux,carriergasvelocityandinlettemperature,liquidmassfractionatinlet,andflowdirection.Comparisonismadebetweentheexperimentaldataforwallandfluidbulktemperaturesandheattransfercoefficients,andthepredictionsofthenumericalmodel.Overall,reasonableagreementisobtainedfordownwardmistflow,inparticularatmoderateheatfluxes;athighheatfluxes,themodelslightlyunderpredictsthelocalheattransfercoefficients.Forupwardmistflow,themodelunderpredictsthelocalheattransfercoefficientstypicallybyabout20%,andappearstopredictdryoutatthetestsectionexitearlierthanexperiment.Someparametricandsensitivitycalculationresultsarealsopresentedanddiscussed.