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,110004,.:-,;,,;,.;;;TF777:2007203204:2007205212:(No.50274022):(1980),,;(1965),,,,.,RTD(residenttimedistribution)[1-4],[1],.,[5-17],,.,,.111130t,=1/5,1.112,Froude,.,:Qm=215Qp(1),QmQp,m3h-1.1Table1Mainparametersformodelandprototypemm4500137336928211335900275738164267113,.,SahaiEmi[6],,:Rinc,mRinc,p=01251-inc,pst1-inc,mw015(2),R,m;,kgm-3;mp,incstw.,,,..,(1),.,.2.29820078JournalofUniversityofScienceandTechnologyBeijingVol.29No.8Aug.20071Fig.1Amplifieddiagramofcollisionandaggregationamongsev2eralinclusionparticles=1/52(2),.Al2O3,Rinc,mRinc,p=Dinc,mDinc,p=316(3)SiO2,Rinc,mRinc,p=Dinc,mDinc,p=4128(4),D,m.2,200m,(3)(4),5516mAl2O34617mSiO2.2Table2Relevantparametersformodelandprototype/(kgm-3)/(kgm-3)7000()3900/2700(Al2O3/SiO2)1000()985()2(a)(b)Fig.2Morphology(a)andinitialsizedistribution(b)ofemulsiondrops3Fig.3Schematicdiagramoftheexperimentalset2up1143,.,,.,,,:t=VtV0(5),t;t;V0,mL;Vtt,mL..,,.2872922114.,---,,,.,-,,,112mmin-1118mmin-1,15%;,.,,---;,,,,;116mmin-1118mmin-1,.,118mmin-1,.4Fig.4Effectoftundishflowrateoninclusionremovalratiowithdifferentflowcontroldevices212,114mmin-1,,5.,,,,;,,-;,400m(11111mAl2O39314mSiO2),-2515%,--.5Fig.5Effectofinitialinclusionparticlediameteroninclusionre2movalratio6Fig.6Pictureshowingthecollisionandaggregationofinclusionparticles2136.:-,,,,,,.,,,;-,,,,.,-,,(6),3878:,,;,,,,,,-,;-,,,,,.,,,.3(1),.,-,,,.,-,,,,.(2)-,200m(50m),-1315%.,,.(3),,,.(4),,,,.[1]ChoJS,LeeHG.Coldmodelstudyoninclusionremovalfromliquidsteelusingfinegasbubbles.ISIJInt,2001,41(2):151[2],,,.T.,2002,1(4):285[3],,,..,2002,14(4):6[4],,,.T.,1998,33(5):24[5]SinhaAK,SahaiY.Mathematicalmodelingofinclusiontransportandremovalincontinuouscastingtundishes.ISIJInt,1993,33(5):556[6]SahaiY,EmiT.Criteriaforwatermodelingofmeltflowandin2clusionremovalincontinuouscastingtundishes.ISIJInt,1996,36(9):1166[7]MartinezE,MaedaM,HeaslipLJ.Effectsoffluidflowonthein2clusionseparationincontinuouscastingtundish.TransISIJ,1986,26:724[8]TozawaH,KatoY,SorimachiK,etal.Agglomerationandflota2tionofaluminaclustersinmoltensteel.ISIJInt,1999,39(5):426[9]MikiY,ThomasBG.Modelingofinclusionremovalinatundish.MetallMaterTransB,1999,30:639[10]ZhangLF,TaniguchiS,CaiKK.Fluidflowandinclusionre2movalincontinuouscastingtundish.MetallMaterTransB,2000,31:253[11],,,..,2004,40(8):623[12],,,..,2003,39(4):431[13],,,..,2004,26(3):247[14],..,2002,14(6):19[15]..,2001,17(4):40[16],,.().,2001,20(2):111[17],,,..,2004,25(1):9(826)48729NumericalsimulationofinertgasflowinladlefurnacelidWENLiangying,CHENDengfu,ZHANGShengfu,BAIChenguang,LONGZhanjunMaterialsScienceandEngineeringSchool,ChongqingUniversity,Chongqing400030,ChinaABSTRACTBasedonthecouplingnumericalsolvingmethod,thevelocitydistributionandflowbehaviorofArinaladlefurnacelidwascalculatedandanalyzedbynumericalsimulation.Theresultsshowthattheappropriateoff2gaspressuresintheperiodsofemergedarcandsubmergedarcare-200-250Paand-120Pa,respec2tively.Whenthebottomblowingrateisverysmall,argoncannotdisperseonthetopofthemoltensteelsurface;astheAr2bottomblowingrateincreasesto2050m3h-1,argoncanbedispersiveanditsflowdistributionissimilarnearthemoltensteelsurface,whichisinfavorofretaininginactivegasAr.Withtheaugmentofthedis2tancefromthemoltensteelsurfacetothetopladleedge,thecirculatingregionofArenlargesonthetopofthemoltensteelsurface,whichisinfavorofavoidingtheincreaseof[O]or[N]inmoltensteel.KEYWORDSfurnacelid;gasflow;numericalsimulation;inertgas;off2gaspressure(784)WatermodelstudyonthemechanismofinclusionremovalinacontinuouscastingtundishZHANGShengjun,ZHENGShuguo,ZHUMiaoyongMaterialsandMetallurgySchool,NortheasternUniversity,Shenyang110004,ChinaABSTRACTTheeffectsofflowcontroldevices,castingspeedofliquidsteelandinclusionsizeoninclusionre2movalinacontinuouscastingtundishwereinvestigatedbychoosingemulsiondropstosimulateinclusionsinawatermodel.Theresultsshowthattheefficiencyofinclusionremovalinthetundishwithweiranddamsisrela2tivelyhighduetothecollisionandaggregationofinclusionsinhighturbulenceregionandtheimprovementofflowfieldinthetundish.Althoughaddingturbulenceinhibitorintothetundishchangesfluidflowlittleinpour2ingregion,ithasnotmucheffectontheefficiencyofinclusionremoval.Itseemstobedifficulttoimprovetheefficiencyofinclusionremovalonlybyoptimizingtheflowcontroldevicesinthetundishwithhighcastingspeedofliquidsteel.KEYWORDScontinuouscastingtundish;flowfiled;inclusion;watermodeling62829