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1、294Langmuir1993,9,294-299SpreadingofaLiquidFilmwithaFiniteContactAnglebytheEvaporation/CondensationProcessPeterC.Wayner,Jr.TheIsermannDepartmentofChemicalEngineering,RenaselaerPolytechnicInstitute,Troy,NewYork12180-3590ReceivedAugust19,1992.InFinalForm:October23,19
2、92ClassicalcondensationandinterfacialconceptsliketheKelvin,Young-Dupre,.andaugmentedYoung-Laplaceequationsareusedtodevelopasimplephysicalmodelofcontactlinemotionforthefdtecontactanglecaseatrelativelylowvelocity.Theoreticalpredictionsofthevelocityarecomparedwithexpe
3、rimentaldataintheliteratureforthefollowingthreesignificantlydifferentsystems:octaneonTeflon(apparentcontactangle,0,=Bo)andmethyleneiodideonnylon(0,=41O)obtainedonflatsurfacesandthecapillaryriseofwaterinadehydroxylatedglasscapillary(0,=36O).Theresultsdemonstratethat
4、theevaporation1condensationprooesscouldhaveasignircanteffectoncontactlinemovementinthesesystemsat293K.Weale0findthattheforcedincreaseintheobservableapparentcontactanglecouldbeanapproximatemeasureofthecondensationrateinthevicinityofthecontactlineandthereforecontactl
5、inevelocityduetocondensation.Introductionetal.11Morerecently,Wayner12theoreticallydemon-stratedthatevaporatiodcondensationshouldbeanim-Thespreadingdynemicsoffluidsonsolidsubstratesportantmechanismincontactlinemotionbecausethehavereceivedconsiderableattentionbecause
6、ofitsgenericpotentialforflowexistsinboththeliquidandvaporspacea.importanceinsuchdiverseproceseesascoating,soldering,Thiswasnumericallydemonstratedforthecompletelylubrication,drying,andthinfilmchange-of-phaseheatwettingcaseinref13.Theobjectiveofthisworkistousetransf
7、er.Themovementofthecontactline(threephaseclaseicalinterfacialconcepts(theKelvin,Young-Dupre,line,TPL)attheleadingedgeofthefilmisofparticularandaugmentedYoung-Laplaceequations)todevelopaimportancebecauseitcontrolstheresultoftheprocess.simplephysicalmodelofcontactlin
8、emotionbasedontheTherefore,aphysicalmodelbawdonintermolecularforcesevaporatiodcondensationproceesforthefgtecontactwouldnotonlybeusefulincorrelati