1、南京理工大學博士學位論文激光照射納米流體形成散斑的特性及應用研究姓名：錢明申請學位級別：博士專業(yè)：光學工程指導教師：倪曉武20080401博士論文激光照射納米流體形成散斑的特性及應用研究AbstractNanofluidsorliquids、析msuspendednanoparticlesarelikelytobethefutureheattransfermediaastheirthermalconductivitiesaresigni

2、ficantlyhigherthanthoseoftheparentliquidsevenifthenanoparticleconcentrationsarenegligibleThemovementofnanoparticlesinfluidsisoneofthemainfactorsthatresultintheremarkablethermalconductivityofnanofluids；howeverthereisnosui

3、tablemethodtodetectthemovementsofnanoparticlesinnanofluidstillnowInthispaper，theformation—mechanismandcharacteristicsofthespeckles，whichareformedbyilluminatingnanofluidswithlaserbeam，areinvestigatedLaserSpeckleVelocimetr

4、y(LSV)ispresentedtomeasurethevelocitiesofnanoparticlesinnanofluidsMoreoverexperimentsarecarriedoutmeasurethevelocitiesofnanoparticlesindirectionalnanofluidswitllLSVAccordingtotheopticalcharacteristicsofnanoparticle，LSVis

5、proposedtomeasurethevelocitiesofnanoparticlesinnanofluids，andtraditionalLSVsystemismodifiedinordertobecompetentfordetectingthemovementsofnanoparticlesLightsheetischangedtoplanelightsource，andCCDdigitalcameraisplacedperpe

6、ndiculartotheincidentlightBythemeansofexperimentsandnumericalsimulations，itisverifiedthatspecklescanbeformedwhennanofluidsareilluminatedbylaserbeamFirst，clearspecklesareformedbyilluminatingstaticnanofluidscontainingprope

7、rvolume行actionofnanoparticlesThen，classicscatteringmodelandphotonnanoparticle—collisionmodelarerespectivelyestablishedbasedonthewaveparticledualityoflightTheformationofspeckleswithnanofluidsissimulatedrespectivelyonthese

8、twomodels，andtheformationmechanismofspecklesisfiguredoutAccordingtotheexperimentalsetup，aphysicalmodelisestablishedBasedonstatisticalpropertiesofspeckles，therelationshipbetweenthemovementsofnaoparticlesandthemovementsofs

9、pecklesonthescreenisstudiedbyformuladeductionAconclusioniSdrawnthatthevelocitiesofnanoparticlesiSidenticaltothevelocitiesofspecklesinFresnelregionThereaftertheexperimentalsystemissetup，andspecklepaRerussequencesarerecord