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1、第5O卷第2期西南交通大學(xué)學(xué)報Vo1.50No.22015年4月JOURNALOFSOUTHWESTJIAOTONGUNIVERSITYApr.2015文章編號:0258-2724(2015)02-0382-06DOI:10.3969/j.issn.0258-2724.2015.02.027靜磁場對熔融液滴振蕩變形影響的相場模擬石萬元,張鳳超,田小紅,沈駿(1.重慶大學(xué)動力工程學(xué)院,重慶400044;2.重慶大學(xué)低品位能源利用技術(shù)及系統(tǒng)教育部重點實驗室,重慶400044;3.重慶大學(xué)材料科學(xué)與工程學(xué)院,重慶400044)摘要:為了解靜磁場作用下熔融液滴振蕩過程的特征,采用相場
2、法數(shù)值模擬了硅熔體液滴的界面變形和內(nèi)部對流過程,分析了軸向靜磁場對初始形狀為二階Legendre函數(shù)硅熔體液滴界面振蕩和內(nèi)部對流的影響.研究表明:施加靜磁場以后,液滴收縮較快,說明靜磁場抑制了液滴內(nèi)部流動;隨著磁場強(qiáng)度從0增加至0.9T,流函數(shù)最大值從0.57減小到0.08,液滴的界面振蕩和內(nèi)部對流逐漸減弱,液滴的長短軸比更快趨近于1,但磁場對液滴的振蕩周期沒有明顯影響,顯示相場法能夠模擬密度較大的熔融液滴的界面振蕩和內(nèi)部對流過程.關(guān)鍵詞:相場模擬;靜磁場;液滴;硅熔體中圖分類號:TK124文獻(xiàn)標(biāo)志碼:APhaseFieldModelingonEfectsofStaticMa
3、gneticFieldonOscillatoryDeformationofMoltenDropletSH/Wanyuan,ZHANGFengchao,TIANXiaohong,SHENJun(1.CollegeofPowerEngineering,ChongqingUniversity,Chongqing400044,China;2.KeyLaboratoryofLow—GradeEnergyUtilizationTechnologiesandSystems,MinistryofEducation,Chongqing400044,China;3.CollegeofMateri
4、alsScienceandEngineering,ChongqingUniversity,Chongqing400044,China)Abstract:Inordertostudythecharacteristicsofoscillatoryprocessofamoltensilicondropletunderstaticmagneticfield,thephasefieldmethodwasadoptedtonumericallysimulatetheinterfaceoscillationandinternalfluidconvectionofamoltensilicon
5、droplet.Theinfluenceofanaxialstaticmagneticfieldontheinternalconvectionandinterfaceoscillationofamohensilicondropletwithaninitialshapeofthesecond—orderLegendrefunctionwasanalyzed.Thenumericalresultexhibitsthattheshrinkofthedropletunderstaticmagneticfieldisfasterthanthatwithoutmagneticfield.
6、Thestaticmagneticfieldsuppressesthefluidconvectioninsidethedroplet.Astheimposedmagneticfieldintensityincreasesfrom0to0.9T,themaximumvaluesofstreamfunctionreducefrom0.57to0.08,andtheinternalconvectionandinterfaceoscillationareweakenedgradually.Undermagneticfield,theratiooflong-axistoshort—ax
7、isofdropletquicklytendsto1.However,themagneticfieldhasalmostnoinfluenceonoscillationfrequencyofdroplet.Theinvestigationindicatesthatthephase.fieldmodelingcaneffectivelysimulatetheinterfaceoscillationandinternalconvectionofthemoltendropletevenwithhighdens