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1、InternationalCommunicationsinHeatandMassTransfer38(2011)518–524ContentslistsavailableatScienceDirectInternationalCommunicationsinHeatandMassTransferjournalhomepage:www.elsevier.com/locate/ichmtExperimentalinvestigationandCFDsimulationofturbulenceeffectonhydrodynamicandmasstransferinap
2、ackedbedairliftinternalloopreactor☆MostafaKeshavarzMoraveji⁎,BaharakSajjadi,MahboubehJafarkhani,RezaDavarnejadDepartmentofChemicalEngineering,FacultyofEngineering,ArakUniversity,Arak38156-8-8349,IranarticleinfoabstractAvailableonline8January2011Theexperimentalinvestigationanditssimula
3、tionusingcomputationalfluiddynamics(CFD)ofhydrodynamicandmasstransferfortwophasebubblyflowinasplitcylindricalairliftreactorwerecarriedKeywords:out.TheturbulenceinfluencesonmasstransferandhydrodynamicparameterswereconsideredwhenAirliftreactorpackingwasinstalledintheriserzone.Further,CFDwa
4、sproperlyabletosimulatehydrodynamicandmassHydrodynamictransferinabubblyflow.Packingexistenceinanairliftreactorincreasedgashold-upanddecreasedliquidMasstransfercoefficientvelocity.Thelowervelocityincreasedthedelaytime(residencetime),whichincreasedthemasstransfer.BubblyflowSincethereisrand
5、omanderraticmovementofliquidbulklayersanddynamicfluctuationsinapackedbedCFDairliftreactorso,Reynoldsnumberincreasedandresultedinmassandmomentumtransferenhancement.Inanunpackedreactor,thesuperficialgasvelocityenhancementchangedtheflowregimefromhomogenoustotransitionwhileinpackedbedreactor
6、thehomogenousflowregimewasonlyobserved.©2010ElsevierLtd.Allrightsreserved.1.IntroductionDoigetal.usedmicrotiterplatecappingmatwiththeporousfits−1installedinabubblecolumnbioreactor.kLawasaround0.06satAbout25%ofallchemicalprocessessuchaswastewatertreatment,aerationrateof0.02m/s[9].aerobic
7、fermentationsandbiologicalproduction(organicacids,NikakhtariandHillincreasedtheoxygenmasstransfercoefficientalcohols,antifoams,alkaloids,antibiotics,proteins)occurbetweenaupto3.7timesinapackedbedexternalloopairliftbioreactor(ELAB)gasphaseandaliquidphase[1].Airliftreactors(ALRs)areoneof
8、theus
