连铸过程多相流、传热凝固及夹杂物运动捕获的研究

连铸过程多相流、传热凝固及夹杂物运动捕获的研究摘要：连铸过程中的多相流、传热凝固和夹杂物运动是影响铸坯质量的重要因素。本文基于数值模拟和实验研究方法，详细分析了连铸过程中多相流、传热凝固和夹杂物运动的特点、机理和模型。针对多相流的模拟，本文采用了欧拉-拉格朗日耦合模型，建立了三维多相流模型，对连铸过程中的气液两相流动进行模拟，并对颗粒、液滴和气泡的运动规律进行了分析。针对传热凝固过程，本文采用了传热凝固模型，考虑了固液相变的影响，对连铸过程中铸坯的温度场和凝固组织进行了模拟，并对凝固组织形貌的演化进行了分析。针对夹杂物的运动，本文采用了平衡相图法和运动学模型，对连铸过程中夹杂物的形成、分布和迁移进行了研究，分析了夹杂物对铸坯质量的影响。通过比较模拟和实验结果，验证了模型的可靠性和准确性，为优化连铸过程提供了理论依据。

关键词：连铸；多相流；传热凝固；夹杂物运动；数值模拟；实验研究

Abstract:Multiphaseflow,heattransfersolidificationandinclusionmovementareimportantfactorsaffectingthequalityofthecontinuouscastingprocess.Basedonnumericalsimulationandexperimentalresearchmethods,thispaperanalyzesthecharacteristics,mechanismsandmodelsofmultiphaseflow,heattransfersolidificationandinclusionmovementinthecontinuouscastingprocessindetail.Forthesimulationofmultiphaseflow,thispaperadoptstheEuler-Lagrangecouplingmodel,establishesathree-dimensionalmultiphaseflowmodel,simulatesthegas-liquidtwo-phaseflowinthecontinuouscastingprocess,andanalyzesthemovementrulesofparticles,dropletsandbubbles.Fortheheattransfersolidificationprocess,theheattransfersolidificationmodelisadopted,andtheinfluenceofsolid-liquidphasechangeisconsidered.Thetemperaturefieldandsolidificationstructureofthecontinuouscastingprocessaresimulated,andtheevolutionofthesolidificationstructuremorphologyisanalyzed.Forthemovementofinclusions,theequilibriumphasediagrammethodandkinematicmodelareadoptedtostudytheformation,distributionandmigrationofinclusionsinthecontinuouscastingprocess,andtheinfluenceofinclusionsonthequalityofthecastslabisanalyzed.Bycomparingthesimulationandexperimentalresults,thereliabilityandaccuracyofthemodelisverified,providingtheoreticalbasisforoptimizingthecontinuouscastingprocess.

Keywords:Continuouscasting;Multiphaseflow;Heattransfersolidification;Inclusionmovement;Numericalsimulation;ExperimentalresearchContinuouscastingisanimportantprocessintheproductionofsteelslabsforvariousapplications.Thequalityofthecastslabiscrucialfordownstreamprocessingandenduse.Inclusions,whicharenon-metallicparticlesorphases,areoneofthemainfactorsaffectingthequalityofthecastslab.Inclusionscancausesurfacedefects,internalcracks,andaffectmechanicalproperties.

Theformationanddistributionofinclusionsareinfluencedbyvariousfactors,suchasthecompositionandcleanlinessofthemoltensteel,castingparameters,andthemolddesign.Inthecontinuouscastingprocess,inclusionscanoriginatefromthesteel-makingprocessorbegeneratedduringcasting.Inclusionscanalsomigrateandagglomerateduringcasting,leadingtonon-uniformdistributionandaccumulationincertainregionsofthecastslab.

Numericalsimulationisaneffectivetoolforunderstandingthecomplexmultiphaseflow,heattransferandsolidificationphenomenainthecontinuouscastingprocess.Acomprehensivemodelthatconsidersthetransportofinclusionsinthemelt,theinteractionbetweeninclusionsandthesolidifyingshell,andtheeffectoffluidflowandthermalconditionsontheinclusiondistributionisnecessaryforaccuratepredictionofinclusionbehavior.

Experimentalresearchisalsoimportantforvalidatingnumericalmodelsandprovidinginsightintotheactualbehaviorofinclusionsduringcasting.Variousanalyticaltechniques,suchasmicroscopyandchemicalanalysis,areusedtocharacterizethesize,shape,compositionanddistributionofinclusionsinthecastslab.

Inconclusion,theformation,distributionandmigrationofinclusionsinthecontinuouscastingprocessarecomplexphenomenathatcansignificantlyaffectthequalityofthecastslab.AcombinationofnumericalsimulationandexperimentalresearchisnecessarytounderstandandoptimizetheinclusionbehaviorinthecontinuouscastingprocessAdditionally,thereareseveralotherfactorsthatcanaffecttheinclusionbehaviorinthecontinuouscastingprocess.Onesuchfactoristhecastingspeed,whichcaninfluencetheflowofmoltensteelandthelikelihoodofinclusionsbeingtrappedoragglomerated.Themolddesignandcoolingconditionsalsoplayacrucialroleindeterminingtheinclusionbehavior,astheyaffectthenucleationandgrowthkineticsoftheinclusions.

Furthermore,thequalityoftherawmaterialsusedinthecontinuouscastingprocesscanimpacttheinclusionbehavior.Forexample,thepresenceofsulfurandphosphorusinthesteelmakingprocesscanleadtotheformationofcomplexinclusionsthataredifficulttoremovefromthemoltensteel.

Theinclusionbehaviorcanalsobeaffectedbythecastingenvironment,suchastheatmosphereandtemperatureconditions.Forinstance,high-temperaturecastingcanpromotetheformationofoxideinclusions,whilelow-temperaturecastingcanleadtotheentrapmentofsulfideinclusions.

Itisimportanttoconsiderallofthesefactorsandtheirinteractionswhendesigningandoptimizingthecontinuouscastingprocesstominimizetheformationandmigrationofinclusions.Thiscanbeaccomplishedthroughacombinationofcomputationalmodelingandexperimentalresearch,aswellasqualitycontrolmeasuressuchasregularinclusionanalysisandtesting.

Inconclusion,theinclusionbehaviorinthecontinuouscastingprocessisacomplexandmultifacetedphenomenonthatrequiresacomprehensiveapproachtounderstandandoptimize.Byconsideringfactorssuchascastingspeed,molddesign,rawmaterials,andcastingenvironment,itispossibletominimizetheformationandmigrationofinclusionsandensuretheproductionofhigh-qualitycastslabsAnotherimportantfactorinminimizinginclusionformationincontinuouscastingistheuseofappropriatesecondarysteelmakingpractices.Duringsecondarysteelmaking,impuritiesandnon-metallicinclusionscanberemovedorreducedusingvarioustechniquessuchasladlerefining,vacuumdegassing,anddesulfurization.Bydecreasingtheamountofimpuritiesinthemoltensteel,theriskofinclusionformationduringcastingcanbeminimized.

Furthermore,propermaintenanceandmonitoringofthecastingequipmentcanalsohelppreventinclusionformation.Regularinspectionandcleaningofthemold,spraycoolingsystem,andnozzlecanpreventthebuildupofscaleandothercontaminantsthatcancontributetoinclusionformation.Additionally,monitoringthequalityofthecoolingwaterandusingappropriatefilterscanpreventtheintroductionofforeignmaterialsintothecastingprocess.

Advancedtechnologiessuchaselectromagneticstirringandultrasonicvibrationcanalsobeusedtoreduceinclusionsduringcontinuouscasting.Electromagneticstirringcanhelpdisperseinclusionsandimprovethehomogeneityofthecaststeel,whileultrasonicvibrationcanbreakupandremovesmallinclusionsfromtheliquidsteel.

Insummary,minimizinginclusionformationduringcontinuouscastingrequiresamultifacetedapproachthattakesintoaccountvariousfactorssuchascastingspeed,molddesign,rawm