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1、ISIJInternational,Vol.46(2006),No.2,pp.210–218ExperimentalSimulationandMathematicalModelingofAirBubbleMovementinSlabCasterMold1)2)1)1)1)VikasSINGH,S.K.DASH,J.S.SUNITHA,S.K.AJMANIandA.K.DAS1)TataSteel,Jamshedpur,831001,India.E-mail:sdash@mech.iitkgp.ernet.in2)DepartmentofMec
2、hanicalEngineering,IITKharagpur,721302,India.(ReceivedonMarch28,2005;acceptedonNovember7,2005)Experimentalsimulationofairbubblemovementina1/3rdscalemodelslabcastermoldhasbeendoneforparallel,upwardanddownwardportsubmergedentrynozzle(SEN)withdifferentwaterflowandairflowratesino
3、rdertostudythebubblepenetrationdepth,horizontaldispersionandtheairjetangle.Ithasbeenobservedthatthebubblepenetrationdepthdependsmoreontheflowrateofwaterratherthanthatofair.Thebubblepenetrationdepthalsodependsontheportangleandonthe“well”providedontheSEN.Belowacertaincriticalw
4、aterflowratetheflowbecomesasymmetricintheslabcastermoldforagivenflowrateofair.SENwithawelldepthmayhelptoavoidbubbleentrapmentdefectsintheslabatthecostofhighersurfacedisturbancesonthemold.Amathematicalmodelingoftheairbubblemovementinwaterwasalsocarriedoutforthesameexperimentals
5、etupwhereitwasobservedthatforsameairflowratethebubblepenetrationdepthwasmoreforhigherwaterflowrateconfirmingtotheexperimentalfindings.Theexperi-encegainedfromtheexperimentandmathematicalmodelinghelpedtofinetunetheparametersatthecastersothatthestrikerateofultralowcarbongradesteel
6、couldbeimprovedsubstantially.KEYWORDS:airbubblemovement;slabcastermold;experimentalsimulation;mathematicalmodeling;bubbledispersionandpenetration.meterstoregulatethefluidflowandbubblemovementin1.Introductionthemold.InjectionofargongasintosubmergedentrynozzleResearchers,across
7、theworld,hadbeenmakingenor-(SEN)isacommonpracticeincontinuouscastingofslabsmouseffortstoestablishthecauseandthemechanismfortopreventthenozzleclogging.TataSteelusesastopper-rodthesedefects,butthedefectscouldnotberemovedcom-1–4)systeminthetundishformetaldeliveryintocurved-typ
8、epletely,inspiteofexercisingalltheprecautionstillnow.mold,whichisinherentlyproneto
