资源描述：
《ebz160掘进机截割部设计》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、DynamicSimulationoftheEntireCrystalGrowthProcess:Multi-ScaleAnalysisofMeltFlowTransientsV.Regnier,L.Wu,B.Delsaute,F.Bioul,N.VandenBogaert,F.DupretCESAME,UniversitécatholiquedeLouvain,E-mail:fd@mema.ucl.ac.beAbstractThispaperinvestigatesthetransientmeltflowevolutionduringacompl
2、eteCzochralskicrystalgrowthprocess.Twobasictimescalesareconsidered.Theshortscaleconcernsthebasictransientsassociatedwithflowoscillationsatdifferentprocessstages.Accurateunderstandingoftheflowmechanismsatthisscaleisrequiredtodevelopanaverageaxisymmetricflowmodelforcompletedynam
3、icsimulations.Thelongtimescaleisassociatedwiththetransientscausedbytheslowersystemevolutionoccurringduringthecompletegrowthprocess.Inordertofocusonthefundamentaleffectsgoverningtheflow,amodelproblemisconsideredwheretheliquidisplacedintoapossiblyrotatingcontainerwhileadiskofsma
4、llerdiameterrotatesonitstopsurface.Boththecontainerandthediskareisothermal.Severaltransienteffectsareinvestigatedincludingtheeffectofdiskradiusincreaseordecrease,andabruptchangesofdiskorcontainertemperatureorrotationrate.Introduction:dynamicmodelingofcrystalgrowthbymeansoftheF
5、EMAGsoftwareThereisincreasingdemandtodayforrobust,reliableanduser-friendlysoftwaretomodelbulkgrowthtechniquessuchastheCzochralski(Cz),LiquidEncapsulatedCzochralski(LEC),FloatingZone(FZ)andVerticalBridgman(VB)processes.Theaimistohelppredict,designandcontrolthegrowthprocesses,an
6、dtobetterunderstandthefactorsaffectingcrystalquality.However,thegrowthtechniquesaremoreandmorecomplex,andoptimizationcanbeachievedonlybyuseofsuitablenumericalmodelingthataccountsfortheseverelynon-linearphysicalphenomenainvolvedaswellasforthehighsystemthermalinertia.Theresultin
7、gproblemiscoupled,global,nonlinearanddynamic.Ontheotherhand,accuratepredictionofcrystalqualityrequiresbothappropriatemodelingofthegoverningphysics,andhighlyaccuratedynamicnumericalmethodsforcomputingtheevolutionofthesolid-liquidinterfaceshapeandthetemperaturefieldgradient5init
8、svicinity.TheFEMAGsimulationsoftwaredevelopedintheCESAMEcente
