連鑄過程多相流、傳熱凝固及夾雜物運(yùn)動(dòng)捕獲的研究摘要：連鑄過程中的多相流、傳熱凝固和夾雜物運(yùn)動(dòng)是影響鑄坯質(zhì)量的重要因素。本文基于數(shù)值模擬和實(shí)驗(yàn)研究方法，詳細(xì)分析了連鑄過程中多相流、傳熱凝固和夾雜物運(yùn)動(dòng)的特點(diǎn)、機(jī)理和模型。針對(duì)多相流的模擬，本文采用了歐拉-拉格朗日耦合模型，建立了三維多相流模型，對(duì)連鑄過程中的氣液兩相流動(dòng)進(jìn)行模擬，并對(duì)顆粒、液滴和氣泡的運(yùn)動(dòng)規(guī)律進(jìn)行了分析。針對(duì)傳熱凝固過程，本文采用了傳熱凝固模型，考慮了固液相變的影響，對(duì)連鑄過程中鑄坯的溫度場(chǎng)和凝固組織進(jìn)行了模擬，并對(duì)凝固組織形貌的演化進(jìn)行了分析。針對(duì)夾雜物的運(yùn)動(dòng)，本文采用了平衡相圖法和運(yùn)動(dòng)學(xué)模型，對(duì)連鑄過程中夾雜物的形成、分布和遷移進(jìn)行了研究，分析了夾雜物對(duì)鑄坯質(zhì)量的影響。通過比較模擬和實(shí)驗(yàn)結(jié)果，驗(yàn)證了模型的可靠性和準(zhǔn)確性，為優(yōu)化連鑄過程提供了理論依據(jù)。

關(guān)鍵詞：連鑄；多相流；傳熱凝固；夾雜物運(yùn)動(dòng)；數(shù)值模擬；實(shí)驗(yàn)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