Two-phase flow characteristics across sudden contraction in small rectangular channels.pdf

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1、ExperimentalThermalandFluidScience32(2008)1609–1619ContentslistsavailableatScienceDirectExperimentalThermalandFluidSciencejournalhomepage:www.elsevier.com/locate/etfsTwo-phaseflowcharacteristicsacrosssuddencontractioninsmallrectangularchannelsa,*abbIngYounChen,Mon-ChernCh

2、u,Jane-SunnLiaw,Chi-ChuanWangaMechanicalEngineeringDepartment,NationalYunlinUniversityofScienceandTechnology,Yunlin640,TaiwanbEnergyandEnvironmentResearchLaboratories,IndustrialTechnologyResearchInstitute,Hsinchu310,TaiwanarticleinfoabstractArticlehistory:Thisstudyexamin

3、esthetwo-phaseflowpatternchangeandpressuredropatthesuddencontractionReceived2February2008fromsmallrectangularchannels(39mmand36mm)intoa3mmdiametertube.Auniquedeflec-Receivedinrevisedform9May2008tionofcontractionpressuredropvs.vaporqualityisobservedataverylowqualityregime

4、withanunu-Accepted9May2008sual‘‘liquidlikevenacontracta”.Themeasuredpressuredropsarecomparedwithexistingcorrelations/models,butnoneofthemcanaccuratelypredicttheavailabledatabase.Byproposingacorrectionfactoraccountingfortheinfluenceofsurfacetension(Bondnumberandcontraction

5、ratio)totheoriginalhomo-Keywords:geneousmodel,considerableimprovementofthepredictiveabilityofhomogeneousmodelisarrived.TheTwo-phaseflowmeandeviationofthiscorrelationis26.18%applicabletothepresentdata(80points)andavailablelit-FlowpatternPressuredroperatures(357points).Sudd

6、encontractionÓ2008ElsevierInc.Allrightsreserved.Venacontracta1.Introductionexpansioninsmallrectangularchannels.Aunique‘‘liquidjet-likeflowpattern”isfoundataverysmallqualityregionwhichisasso-Theflowoftwo-phasemixturesacrosssuddenexpansionsandciatedwithadetectablesetbackofth

7、epressuredifferenceasthecontractionsisrelevantinmanyapplicationssuchaschemicalvaporqualityincreases.Forcomparingpurpose,themeasuredreactors,powergenerationunits,oilwellsandpetrochemicalpressurechangedatasubjecttosuddenexpansionarecomparedplants.Asthetwo-phasemixtureflowst

8、hroughthesuddenareawiththepredictionsofavailablecorrelationsfromtheliterature.changes,theflowmightformas