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1、JOM,Vol.66,No.7,2014DOI:10.1007/s11837-014-1010-3ó2014TheMinerals,Metals&MaterialsSocietyLargeEddySimulationofTransientFlow,Solidi?cation,andParticleTransportProcessesinContinuous-CastingMold111,21ZHONGQIULIU,LINMINLI,BAOKUANLI,andMAOFAJIANG1.SchoolofMaterialsandMeta
2、llurgy,NortheasternUniversity,Shenyang110819,PeoplesRepublicofChina.2.e-mail:libk@smm.neu.edu.cnThecurrentstudydevelopedacoupledcomputationalmodeltosimulatethetransient?uid?ow,solidi?cation,andparticletransportprocessesinaslabcontinuous-castingmold.Transient?owofmolt
3、ensteelinthemoldiscalcu-latedusingthelargeeddysimulation.Anenthalpy-porosityapproachisusedfortheanalysisofsolidi?cationprocesses.Thetransportofbubbleandnon-metallicinclusioninsidetheliquidpooliscalculatedusingtheLagrangianapproachbasedonthetransient?ow?eld.Acriterion
4、ofparticleentrapmentinthesolidi?edshellisdevelopedusingtheuser-de?nedfunctionsofFLUENTsoftware(ANSYS,Inc.,Canonsburg,PA).Thepredictedresultsofthismodelarecomparedwiththemeasurementsoftheultrasonictestingoftherolledsteelplatesandthewatermodelexperiments.Thetransientas
5、ymmetrical?owpatterninsidetheliquidpoolexhibitsquitesatisfactoryagreementwiththecorrespondingmeasurements.Thepredictedcomplexinstantaneousvelocity?eldiscomposedofvarioussmallrecirculationzonesandmultiplevortices.Thetransportofparticlesinsidetheliquidpoolandtheentrapm
6、entofparticlesinthesolidi?edshellarenotsymmetric.TheMagnusforcecanreducetheentrapmentratioofparticlesinthesolidi?edshell,especiallyforsmallerparticles,buttheeffectisnotobvious.TheMarangoniforcecanplayanimportantroleincontrollingthemotionofparticles,whichincreasesthee
7、ntrapmentratioofparticlesinthesolidi?edshellobviously.NomenclaturehSensibleenthalpyaoOxygenconstanthmDistancebelowthemeniscusATemperaturecoefficientofsurfacetensionhrefReferenceenthalpyofpureironHTotalenthalpyAFSuperficialareaDHLatentheatAmuchMushyzoneconstantDH°Stan
8、dardheatofadsorptionCDSoluteconcentrationkThermalconductivityCDDragcoefficientkoConstantrelatedtotheentropyofoxygenCLLiftcoefficien
