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1、InvestigationofanEvaporatingExtendedMeniscusBasedontheAugmentedYoung-LaplaceS.DasGuptaEquationJ.A.SchonbergThemicroscopicdetailsoffluidflowandheattransfernearthecontactlineofanevaporatingextendedmeniscusofheptaneformedbetweenahorizontalsubstrateanda"washer"werestudie
2、datlowheatfluxes.ThefilmprofileinthecontactlineP.C.Wayner,Jr.regionwasmeasuredusingellipsometryandmicrocomputer-enhancedvideomi•croscopy,whichdemonstratedthedetailsofthetransitionbetweenanonevaporatingTheIsermannDepartmentofsuperheatedflatthinfilmandanevaporatingcurv
3、edfilm.UsingtheaugmentedChemicalEngineering,Young-Laplaceequation,theinterfacialpropertiesofthesystemwereinitiallyeval•RensselaerPolytechnicInstitute,uatedinsituandthenusedtodescribethetransportprocesses.NewanalyticalTroy,NY12180-3590proceduresdemonstratedtheimportan
4、ceoftwodimensionlessparameters.Bothfluidflowandevaporationdependontheintermolecularforcefield,whichisafunctionofthefilmprofile.Thethicknessandcurvatureprofilesagreedwiththepredictionsbasedoninterfacialtransportphenomenamodels.Theheatfluxdistri•butionandthepressurefie
5、ldwereobtained.Sincetherearesignificantresistancestoheattransferinthissmallsystemduetointerfacialforces,viscousstresses,andthermalconduction,the"idealconstantheatflux"cannotbeattained.Thede•scriptionofthepressurefieldgivesthedetailsofthecouplingbetweenthedisjoiningan
6、dcapillarypressures.IntroductionTheaugmentedYoung-LaplaceequationhasbeenusedtoandWayner(1972)initiallyusedEq.(1)tomodelevaporationmodelthe"pressurejump,"/*,-P„,attheevaporatingliquid-fromanextendedmeniscus,whichconsistedoftheintrinsicvaporinterfaceinthecontactlinereg
7、ion(PotashandWayner,meniscusdescribedbytheclassicalequationofcapillarity,oK,1972;Renketal.,1978;MoosmanandHomsy,1980;Cookandathinadsorbedfilmextendingbeyondtheintrinsicme•etal.,1981;Wayner,1991):niscusdescribedbythedisjoiningpressure,-II.Thesecon•ceptsareofgenericimp
8、ortanceinsuchdiversefieldsas5Pl-Pv-oK(1)spreading,drying,lubrication,condensation,boiling,heatpipes,andthermosyphons.Toplacethiswor
