搜索
599Vol59No920089JournalofChemicalIndustryandEngineering(China)September2008沈雪松,沈春银,李光,戴干策(,200237):;;;:TQ0211:A:0438-1157(2008)09-2220-06BubbleformationfromlargesubmergedsingleorificeathighgasvelocitySHENXuesong,SHENChunyin,LIGuang,DAIGance(StateKeyLaboratoryofChemicalEngineering,EastChinaUniversityofScienceandTechnology,Shanghai200237,China)Abstract:Theformationofbubblesgeneratedinabubblecolumnwith190mmIDfromlargeorificesathighgasvelocitywasstudiedforair-deionizedwatersystemTheexperimentsweremadewithorificediametersvaryingfrom4mmto21mmandholegasvelocityintherangeof081548ms-1ThebubbleshapeandbubblesizewererecordedbyCCDcamera,criticalholegasvelocityforbubbledeformationwasderivedfromthetransitionofaspectratioofbubblesTheresultsshowedthatbubblesweresphericalwhenholegasvelocitywaslowerthan20ms-1Whenholegasvelocitywashigherthan50ms-1,theshapeofbubbleschangedtoellipticalAcorrelationequationwasestablishedforbubblesizeasafunctionofholegasvelocityandorificediameter,andtheequationpredictedthebubblesizewellfororificediameterlargerthan3mmandholegasvelocityfrom10ms-1to80ms-1inair-deionizedwatersystem.Keywords:bubbleformation;bubbleshape;largeorifice;highgasvelocity2008-01-16,2008-03-17::(1983),,:(05DJ14002),,,,,,;;,,Receiveddate:2008-01-16.Correspondingauthor:Prof.DAIGance.E-mail:gcdai@ecusteducnFoundationitem:supportedbytheImportantFundamentalProgramofShanghai(05DJ14002).,,2060Kumar[1-3],;,Wraith[4],2080,,Mersmann[5]Weber(We)2,Rabiger[6]Weber;Miyahara[7]1,Weber(WeO)Bond(Bo),3mmOzawa[8],,Joshi[9]3mm6mmIdogawa[10]Lei[11],[12-13][14-15](8mm)(20ms-1),(218mm35ms-1),,,,,,,1:,1190mm1200mm,330mm330mm530mm48101521mm-,380mm,;1~15m3h-1,08~1548ms-1;(16)(01MPa),005MPa,,CCD,CCD100Hz,640480;,,,,;5001Fig1Schematicdiagramofexperimentalsetup1buffertank;2,3,4valve;5,6flowmeter;7lightsource;8squaregroove;9orifice;10bubblecolumn;11CCDcamera;12computer2,()()/(),[16],21,,,2,;,,,,22219:2Fig2Bubbleshapeatdifferentorificeswithvariousholegasvelocity,,22,3,,;,,3Fig3Effectoforificediameteronbubblesize(DT=190mm,H0/DT=2)23410mm4(a)35~195ms-1,4(b)212~495ms-1,4(c)513~602ms-1,20ms-1,[4(a)];20~50ms-1,,[4(b)];50ms-1,,,[4(c)]4Fig4Transitionofbubbleshape,,,(aspectratio)E,()(5),,1,;15,45,:E1,UO20ms-1;1E15,20ms-1UO50ms-1;E15,UO50ms-12222595Fig5Effectoforificegasvelocityonaspectratioofbubbles(DT=190mm,H0/DT=2)24,Wraith[4]Vb=109Q6/5g-3/5(1)Kumar[3]Vb=202515lQ2lg075(2)Kulkarni[17],Gaddis[18]Db=6DOlg+81lQg+135Q242g5/3025(3)(1),,,,(2)(3),,33,6~86WraithFig6ExperimentaldataversusWraithscorrelation10%,,3,,,Matlab,(4)Db=328D077OU036O(4)(4),,9(a)(4),,,10%(4),,5945[1]3673[1]3[19]1378mm[1],9(b)9(b),(4)594536733mm,1378mm22239:9Fig9Comparisonbetweenexperimentalandpredicteddata10%,:-3mm10~80ms-1(10ms-1),[20],3:,()3(1),:UO20ms-1,;20ms-1UO50ms-1,,;UO50ms-1,,(2),-3mm10~80ms-1-,,(),BoBond(Bo=lgD2O/)Db,mmDO,mmDT,mmg,ms-2H0,mmQ,m3s-1UO,ms-1Vb,m3WeWeber(We=lU2bDb/)WeOWeber(WeO=lU2ODO/)l,Pasl,kgm-3,Nm-1References[1]RamkrishnanS,KumarR,KuloorNRStudiesinbubbleformation():BubbleformationunderconstantflowconditionsChemicalEngineeringScience,1969,24:731-747[2]SatyanarayanaA,KumarR,KuloorNRStudiesinbubbleformation():BubbleformationunderconstantpressureconditionsChemicalEngineeringScience,1969,24:749-761[3]KhuranaAK,KumarRStudiesinbubbleformation().ChemicalEngineeringScience,1969,24:1711-1723[4]WraithAETwostagebubblegrowthatasubmergedplateorificeChemicalEngineeringScience,1971,26:1659-1671[5]MersmannAFloodingpointofliquid/liquidcountercurrentcolumnsChemicalEngineeringTechnology,1980,52:933-942[6]RabigerN,VogelpohlABubbleformationinstagnantandflowingNewtonianliquidsGermanChemicalEngineering,1982,5:314-323[7]MiyaharaT,HagaN,TakahashiTBubbleformationfromanorificeathighgasflowratesInternational222459ChemicalEngineering,1983,23:524-531[8]OzawaY,MoriKEffectofphysicalpropertiesofgasandliquidonbubbling-jettingphenomenaingasinjectionintoliquidTransactionsoftheIronandSteelInstituteofJapan,1986,26:291-297[9]ThoratBN,ShevadeAV,JoshiJB,etalEffectofspargerdesignandheighttodiameterratioonfractionalgashold-upinbubblecolumnsTransIChem:PartA,1998,76:823-834[10]IdogawaK,IkedaK,FukudaTFormationandflowofgasbubblesinapressurizedbubblecolumnwithasingleorificeornozzlegasdistributorChemicalEngineeringCommunication,1987,59:202-212[11]LeiZhang,MasahiroShojiAperiodicbubbleformationfromasubmergedorificeChemicalEngineeringScience,2001,56:5371-5381[12]ChenFeng(),PengYao(),SongYaozu(),ChenMin().FormationofasinglebubbleunderadiabaticconditioninelectricfieldJournalofChemicalIndustryandEngineering(China)(),2007,58:1706-1712[13]EstelleIacona,CilaHerman,ShinanChang,ZanLiuElectricfieldeffectonbubbledetachmentinreducedgravityenvironmentExperimentalThermalandFluidScience,2006,31:121-126[14]NahraHK,KamotaniYBubbleformationfromwallorificeinliquidcross-flowunderlowgravityChemicalEngineeringScience,2000,55:4653-4665[15]NahraHK,KamotaniYPredictionofbubblediameteratdetachmentfromawallorificeinliquidcross-flowunderreducedandnormalgravityconditionsChemicalEngineeringScience,2003,58:55-69[16]LoimerT,MachuG,SchaflingerUInviscidbub