Study on Characteristics of Steady Flow Condensation Heat Transfer in a Fube Under Zero—Gravitation-中国Betway体育网页登陆

摘要 Inthispaper,theannularflowmodelforin-tubecompletedcondensationisemployedtopredictthesteadyflowcondensationheattransfercharactersticsinatubeunderzero-gravitation.Inthiscase,itisproposedthatvaporcondensesontheliquidfilmsurface.Duetotheeffectofsurfacetension.Thelituidexistsintheformofliquidfilmringcontactingwall;whenthevelocityofvaporcoredecreasestozero,thecondensationprocessends.Puttingforwardthephysicalandmathematicalmodels,theproblemissolvedandthemulti-orderequationofthethicknessofliquidfilmisobtained.Whichincludestermsofthepressuregradientalongaxialdirection.thefrictionforcebetweenvaporandliquidoninterface.Bycomputationalcalculation,thismodelcanbeusednotonlytopredictthethicknessofliquidfilm,thecondensationpressuregradientalongtheaxialdirection,butalsotodeterminetheNusseltnumber,thecondensationleagthandthetotalflowprssuredropofcondensationetc.Attheend,thecalculationresultsofthenecessarycondensationlengtharecomparedapproximatelywiththosefromtheexperiments,whichareobtainedonthetestset-upplacedhorizontallyingravitationfield.andthedeviationisanalyzed.

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Study on Characteristics of Steady Flow Condensation Heat Transfer in a Fube Under Zero—Gravitation

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