KDP晶體生長流體剪應(yīng)力分布.pdf

1、重慶大學(xué)碩士學(xué)位論文KDP晶體生長流體剪應(yīng)力分布姓名：李連杰申請學(xué)位級別：碩士專業(yè)：熱能工程指導(dǎo)教師：李明偉20070425重慶大學(xué)碩士學(xué)位論文英文摘要ABSTRACT111eKDPcrystalwasdevelopedfromthe40’Softhetwentiethcentury；itisonekindofelectroopticsandnonlinearopticalmaterialsItisbroadlyappliedtosom

2、ehightechnologyfieldssuchaslaserfrequencyconversion，electroopticsmodulated，raycelerityswitchandSOonItischaracterizedbyverybigelectroopticsandnonlinearopticalcoefficientandhi曲damagethresholdInparticularlylargesizesinglecr

3、ystalfortheraytogetacrosscanbegrownLargesizeKDPcrystalistheonlymaterialwhichcallbeusedinICF(inertialconfinementfusion)l巾tillnowRecentlythehotspotsofinvestigationaboutKDPcrystalare“improvingitsgrowthspeed，shorteningitsgro

4、wthcycleandreducingitscostundertheconditionofmaintainingagoodcrystalqualityThemorphologicalstabilityandinclusionformationdependstronglyontheshearstressdistributionatthecrystalsurface；thedirectionvelocityandheightofgrowin

5、gstepatthecrystalsurfaceareconsanguineeuslyrelatedwiththestateofsolution’Sflowingnearthecrystalsurface，theshearstressdistributionatthecrystalsurfacehasimportanteffectonthethicknessofboundarylayerthethicknessofboundarylay

6、erhasgreatinfluenceonthequalityandthegrowingvelocityofKDPcrystalSostudyontheshearstressdistributionatthecrystalsurfaceispropitioustogrowlargeandhighqualityKDPcrystalAthreedimensionalnumericalsimulationoftheshearstressdis

7、tributiononKDPcrystal’SsurfacehasbeencarriedoutbyusingthefinitevolumemethodTheeffectofthesurfaceshearstressdistributiononthegrowthofKDPcrystalhasbeenobtainedwhichishelpfulfortheexperimentstudyonthemechanismbyAFMinthefutu

8、reTheeffectsofthemagnitudeofthesolutionvelocity，thepositionofsolutioninletandseedcrystalsizeonthesurfaceshearstressdistributionofKDPcrystalisconsideredByanalyzingthevelocityvectordistributionofvertical，horizontalandsides

9、ectioninthecrystallizerandtheshearstressdistributionattheKDPcrystalsurfacesuchasup—surface，behind—surface，leftsurface，thefollowingresultsCallbefound：thevalueoftheshearstressatthesideofcrystalnearbytheinletislargeranditwi

10、llincreasewiththeincreaseoftheinletvelocityandtheseedsize111cshearstressdistributionsatKDPcrystalsurfacewillchangewiththechangeoftheinletvelocitythepositionoftheinletandtheseedsizeTheconclusionsofmodifiedphysicalmodelare