07-Water-model Experiment on Melting Powder Trapping by Vortex in the Continuous Casting Mold

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1、ISIJInternational,Vol.47(2007),No.7,pp.982–987Water-modelExperimentonMeltingPowderTrappingbyVortexintheContinuousCastingMold1)2)NorifumiKASAIandManabuIGUCHI1)KashimaSteelWorks,SumitomoMetalsInd.,Ltd.,3Hikari,Kashima,Ibarakki314-0014Japan.2)DivisionofMaterialsScienceandEngineering,GraduateSchoo

2、lofEngineering,HokkaidoUniversity,North13West8,Kita-ku,Sapporo060-8628Japan.(ReceivedonMarch14,2007;acceptedonApril25,2007;originallypublishedinTetsu-to-Hagané,Vol.92,2006,No.9,pp.544–550)Water-modelexperimentshavebeencarriedouttounderstandthebehaviorofmoldpowdertrappingphenomenabyvortexincont

3、inuouscastingmold.Thefollowingfindingsareobtained.(1)Moldpowdertrappingbythevortexoccursirregularlyneartheimmersionnozzle.Itoccursonlyinthewakeoftheimmersionnozzle.(2)Asfortheoccurrencefrequencyratioofthevortex,themaximumvalueappearsinthewaterflowrateregimerangingfrom61.4to70.2L/min.Thisregimeis

4、supposedtohavealoserelationshipwithwaterflowvelocitychangeneartheimmersionnozzle.(3)Anempiricalequationisproposedforthelengthofthemoltenmoldpowderentrappedbythevor-tex.KEYWORDS:continuouscasting;moldpowder;trapping;vortex;water-model.occurrencefrequencyofmoldpowdertrappingandthe1.Introductionpe

5、netrationdepthofthevortexjustbeforetrappingwerein-Inrecentyears,asforthemechanismofmeltedmoldvestigatedindetail.powdertrappinginthehigh-speedcontinuousslabcastingmold,water-modelexperimentshavebeenextensivelycar-1–4)2.ExperimentalApparatusandProcedureriedout,andmuchinformationisavailable.Forex

6、am-ple,criticalvelocitiesformoldpowdertrappingcausedbyTheexperimentapparatususedforthewater-modelex-4)severalmechanismswerederivedbyYoshidaetal.TheperimentsisschematicallyshowninFig.1.Themodelcriticalvelocitydataareusefulforinvestigatingplansformoldisa1/2.5scaleoftheactualcontinuouscastingma-t

7、hepreventionofthemoldpowdertrappingintherealcon-tinuouscastingmold.Unfortunately,themostinfluentialmechanismofmoldpowdertrappingisnotclarifiedyet.Furtherinvestigationisrequestedfortheclarificationofthemechanism.TheKarman’svortexesformeddow