w2fo液滴绕微柱阵列运动的数值模拟-研究

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1、西安建筑科技大学硕士学位论文TheNumericalSimulationaboutmotionofW/Omicro-dropletsguidedbypillararraySpecialty:Heating,GasSupplying,VentilationandAirConditioningName:XuLinInstructor:Prof.ZhangHong-yan,A/P.CuiHai-hangAbstractSincethe90soflastcentury,animportanttrendofthenaturalsciencesandengineeringtechnologydeve

2、lopmentismovingtowardsminiaturization.Attentionstransferawayfromthefamiliarconventionalscaletotheunfamiliarmicro/nano-scale,especiallyinmicro-mechanicalsystems(MEMS)andnano-materialfields.Thisarticleappliedphase-fieldmethodandestablishedatwo-phasemicroscalemodeltoachievethewater-liquidtwo-phasefl

3、uiddynamicsimulation，whichwasbasedonthelaminarmultiphaseflowtheory.Itstudiedthemanipulationtechnologyofwater-in-oil(W/O)dropletsimmersedinsiliconeoil.Thedetailcontentsarelistedasbelow:Firstly,thesurfacetensionwasintroducedintoN-Sequationonthebasisoftwo-phaselaminarflowtheory，andthephaseinterfaceb

4、etweentwoliquidswasdeterminedthroughthefunctionΦ.Secondly，consideringtheimpactsofmicropillararraysarrangedinsidemicrochannel，weinvestigatedthetrajectoryanddeformationofdroplets,thevelocitiesofdropletswithdifferentsizes,thepositionsofdropletsreleasedfromthelastmicropillar.Next,westudiedthemergingo

5、ftwodropletsaswellasthemixingoftwodifferentconcentrationsub-regionsinsideonedroplet.Finally,wealsoinvestigatedthedividingofdropletsbyawedge-shapedobstacleinthecasethatthesurfacetensionisdominantforce.Theresultsshowthatthemicro-pillararrayembeddedinmicrochannelhasagreatimpactforthemovementofdrople

6、ts.Forthedropletshape，thebackgroundoilflowandpillararraywillchangethetrajectoryofdropletsandforcedropletstobedeformedand西安建筑科技大学硕士学位论文stretched.Forthevelocities，dropletshavethesamevelocityunderthesameflowconditionapproximately,whichisindependentofthesizeofdroplet.However,dropletsownthedistinctrel

7、easingpositionsbecausetheyweredeformedandaffectedbythepillarswhenleavingfromthelastpillar.Fortwodropletsthatareplacedcloselyattheinitialstage,theywilldeformandmergetogetherwhentheymoveintoandtouchwithmicropillararray.T