Title of article :
PressuredropsforsteamandwaterflowinheatedtubesOriginalResearchArticle
Author/Authors :
L.K.H.Leung، نويسنده , , D.C.Groeneveld، نويسنده , , A.Teyssedou، نويسنده , , F.Aubé، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
Measurementsofpressuredropforasteamandwaterflowinsideseveralheatedtubeswereobtainedattwodifferentlaboratories(ChalkRiverLaboratoriesandÉcolePolytechnique).ThetestsectionsusedtocarryouttheexperimentswereconstructedwithInconel-600tubes,andwerecooledinternallywithanupwardflowofwater.Areductioninfrictionalpressuregradientwithanincreaseinheatfluxwasobservedforsingle-phaseflowsatthesamecross-sectional-averageconditions.Afterboilingwasinitiated,thetwo-phasefrictionmultiplierincreasedwithincreasingheatfluxinthebubbly-flowregion,butdecreasedintheannular-flowregion.Astheheatedsurfaceapproacheddryout,thetwo-phasefrictionmultiplierexhibitedamaximumvalueanddecreasedwithincreasingthermodynamicquality,untildryoutoccurred.Thedecreasingtrendwasattributedtoareductionintheliquid-filmthicknessandtheterminationofliquidentrainment.Followingtheoccurrenceofcriticalheatflux,asignificantdropinfrictionalpressuregradientwasnoted,causedbythechangeinthenear-wallsublayertoalow-viscosityvaporblanket.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah
