[Perfect]Bubble Size， Interfacial Area， and Liquid-Phase Mass Transfer Coefficient in Bubble.pdf

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1、BubbleSize,InterfacialArea,andLiquid-PhaseMassTransferCoefficientinBubbleColumnsKiyomiAkitaTokushimaUniversify,Tokushima,JapanandFumitakeYoshida*KyotoUniversityKyoto,JapanExperimentaldataonbubblesizedistributionandgasholdupwereusedtocalculatethespecificgas-liquidinterfacial

2、areaainbubblecolumns.Theliquid-phasemasstransfercoefficientkLwasevaluatedfromaandthekLadataforoxygenabsorptionintoseveralliquidshavingdifferentphysicalproperties.Dimensionlesscorrelationsareproposedfortheaveragebubblesize,a.andk~.Althoughcorrelationsforthevolumetricliquid-p

3、hasecolumnandtheflashlighttoobtainmoreuniformillumi-masstransfercoefficientinbubblecolumnskI>a,suchasnation.ItwaspossibletofocusatsomedistancefromtheproposedbyAkitaandYoshida(1973),areusefulforde-columnwall.Inmostexperimentsthefocussedplanewassignpurposes,itissometimesneces

4、sarytosplitk1,aintoapproximatelymidwaybetweenthewallandtheaxisofkI,,theliquid-phasemasstransfercoefficient,anda,thethecolumnandataheight150cmfromthebottom.En-specificgas-liquidinterfacialarea.Forinstance,onemustlargedprintsweremadesothatthebubblesizewasaboutknowthevalueofk1

5、.beforehecantheoreticallypredict3to5timestheactualsize.Ascaleinstalledinthecol-theenhancementfactorforabsorptionwithchemicalumnatthefocusservedasthebasisforcomparison.Fig-reactionorgas-liquidreaction.ure2showsexamplesofphotographsofbubblestakenforThepresentpaperreportsthere

6、sultsofexperimentalthesystemsandgasvelocitiesasindicated.Severalhun-studiesonthebubblesize,interfacialarea,andaveragedredtofewthousandbubbleswerescaledinthreetotenklvaluesinbubblecolumnsasfunctionsofpropertiesofpicturesforasinglerun.Thebubbleshapewasnotaliquids,thecolumndia

7、meter,andthesuperficialgasve-spherebutcouldbeapproximatedbyanoblatespheroid.locity.Themaximumandminimumdimensionsofindividualbubbleswerescaledonphotographicprints.ExperimentalSectionFigure1showstheexperimentalsetupwithanarrange-BubbleSizeDistributionmentforthephotographicme

8、asurementofthebubblesize.Threecolumnswereused.Theyweremadeoftrans-Figure3isanexamp