連鑄過程多相流、傳熱凝固及夾雜物運動捕獲的研究

連鑄過程多相流、傳熱凝固及夾雜物運動捕獲的研究摘要：連鑄過程中的多相流、傳熱凝固和夾雜物運動是影響鑄坯質(zhì)量的重要因素。本文基于數(shù)值模擬和實驗研究方法，詳細分析了連鑄過程中多相流、傳熱凝固和夾雜物運動的特點、機理和模型。針對多相流的模擬，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，對連鑄過程中的氣液兩相流動進行模擬，并對顆粒、液滴和氣泡的運動規(guī)律進行了分析。針對傳熱凝固過程，本文采用了傳熱凝固模型，考慮了固液相變的影響，對連鑄過程中鑄坯的溫度場和凝固組織進行了模擬，并對凝固組織形貌的演化進行了分析。針對夾雜物的運動，本文采用了平衡相圖法和運動學(xué)模型，對連鑄過程中夾雜物的形成、分布和遷移進行了研究，分析了夾雜物對鑄坯質(zhì)量的影響。通過比較模擬和實驗結(jié)果，驗證了模型的可靠性和準確性，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；夾雜物運動；數(shù)值模擬；實驗研究

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