表面張力對(duì)光致空泡動(dòng)力學(xué)特性影響的實(shí)驗(yàn)研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文表面張力對(duì)光致空泡動(dòng)力學(xué)特性影響的實(shí)驗(yàn)研究姓名：賀杰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：光學(xué)指導(dǎo)教師：陸建20080601Abstract碩fj論義AbstractSurfacetensioneffectsonthegrowthandcollapseofacavitationbubbleandthemechanicaleffectsneararigidboundarywasinvestigatedbyafiberopticd

2、iagnostictechniquebasedonopticalbeamdeflection(OBD)IntheexperimentalstudycavitationbubbleWasinducedbyfocusingtheNd：YAGlaserintothevesselcontainingliquidswithdifferentsurfacetension，theexpansionandcollapseofbubbleandtheno

3、rmalforceactingonthesurfacewereinvestigatedbyasensitivefiberopticsensorTheeffectofsurfacetensiononcavitationoscillationincludesbubbleradius，thebubblewallvelocitybubbleenergyAstothecaseofmechanicaleffects，thesurfacetensio

4、nhassubstantialeffectontheliquidjetandbubblecollapsedurationBesides，accordingtoexperimentalresultsandthemodifiedRayleightheory，themaximumbubbleradiustheliquidjetpressureandtheliquidjetvelocitywereobtainedandtheyallchange

5、dwiththeincreasingsurfacetensionTheotherpartofmyresearchisnumericalanalyses，whichWasbasedonRayleighPlessetequationAfinitedifferentmethodisappliedtonumericallysimulatetheeffectofsurfacetensionontheentireprocessofbubbleosc

6、illationThesenumericalresultsaleconsistentwithexperimentalresults，whichprovethevalidityofourexperimentalresultsMoreoverviathemechanismofmechanics，thephysicalphenomenoninducedbysurfacetensioneffectsintheexpansionandcollap

7、seofbubblewasanalyzedAsweknowsurfacetensionhasthetendencytoreducethevolumeofthecavityForaninitiallysphericalcavitygrowingandcollapsingneararigidwall，duringthegrowthphasesurfacetensionwillhavetheeffectofstabilizingthedefo

8、rmationofthecavityandmakeitclosertoasphericalshape，andduringthecollapsephasesurfacetensionwillhavetheeffectofdestabilizingthedeformationofthecavity，acceleratingthecollapse，andthuswillhavethetendencytostrengthenthecavitat

9、ionerosioneffectsTheseresultshelptobetterunderstandthecavitationerosionandoptimizelaserparametersinthefieldsoflaserophthalmologyandunderwaterlaserprocessingKeywords：Opticalbeamdeflection，Cavitationbubble，surfacetension，c