Title of article
Structureofair–watertwo-phaseflowinhelicallycoiledtubesOriginalResearchArticle
Author/Authors
YuichiMurai، نويسنده , , ShinjiYoshikawa، نويسنده , , Shin-ichiToda، نويسنده , , Masa-akiIshikawa، نويسنده , , FujioYamamoto، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
13
From page
94
To page
106
Abstract
Air–watertwo-phaseflowinhelicallycoiledtubesisinvestigatedexperimentallytoelucidatetheeffectsofcentrifugalaccelerationontheflowregimemapandthespatialandthetemporalflowstructuredistribution.Threekindsoftesttubeswith20mminnerdiametersincludingastraighttubeareusedtocomparetheturbulentflowstructure.Superficialvelocitiesupto6m/saretestedsothatthecentrifugalFroudenumbercoversarangefrom0to3.Theinterfacialstructureisphotographedfromtwodirectionsbyahigh-speedvideosystemwithsynchronizedmeasurementoflocalpressurefluctuations.Theresultsrevealthattheflowtransitionlinealtersduetocentrifugalforceactingontheliquidphaseinthetube.Inparticular,thebubblyflowregimeisnarrowedsignificantly.Thepressurefluctuationamplitudegetslargerelativelytotheaveragepressurelossasvoidfractionincreases.Thefrequencyspectraofthepressurefluctuationhavepluralpeaksinthecaseofstrongcurvature,implyingthattheperiodicityofsluggingtwo-phaseflowiscollapsedbyaninternalsecondaryflowactivatedinsidetheliquidphase.Moreover,underlargeFroudenumberconditions,thesubstantialvelocityofthegasphasethatbiasestotheinnersideofthehelicalcoilisslowerthanthetotalsuperficialvelocitybecausetheliquidflowisallowedtopassthroughtheoutersideandsoresemblesaradialstratifiedflow.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2006
Journal title
Nuclear Engineering and Design Eslah
Record number
895976
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