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1、0263–8762/06/$30.00+0.00#2006InstitutionofChemicalEngineerswww.icheme.org/cherdTransIChemE,PartA,August2006doi:10.1205/cherd.05178ChemicalEngineeringResearchandDesign,84(A8):677–690CFDSIMULATIONOFFLOWANDAXIALDISPERSIONINEXTERNALLOOPAIRLIFTREACTORS.ROY,M.T.DHOTREandJ.B.JOSHIInstituteofChe
2、micalTechnology,UniversityofMumbai,Matunga,Mumbai,Indianthepresentwork,aCFDsimulation,usingtwo-fluidmodel,hasbeenperformedtoIobtaintheflowpatternandthegashold-upinexternalloopair-liftreactors(EL-ALR).Anagreementwasobservedbetweenthepredictedandtheexperimentaldataavailableinthepublishedliter
3、ature.ThevalidatedCFDmodelhasbeenextendedforthesimulationofmixingandtheaxialdispersioncoefficient.CFDpredictionsofmixingtimearewellinagreementwiththeexperimentalvaluespublishedinliterature,andtheresultsofaxialdispersioncoefficientalsoshowgoodagreementwiththeexperimentalvaluespublishedinlite
4、ratureexceptinthecaseofVialetal.(2005),wheretheCFDmodelunderpredicts.Asys-tematicnumericalstudywasundertakentounderstandtherelativecontributionofconvectionandeddydiffusiontothemixingandaxialdispersion.Keywords:CFD;mixing;axialdispersioncoefficient;airliftreactor.INTRODUCTIONnamelythedownco
5、mer,theriserandthegasdisengage-mentsection(Figure1).SpargingofthegasphasecanbeOverthepastthreedecadesmanyresearchersacrosstheaccomplishedintheriserand/orinthedowncomer.Spar-worldhaveputtheirqualitytimeonunderstandingthegingintheriserleadstoagas–liquidup-flowintheriserhydrodynamicbehaviouro
6、fairliftreactors,themostpopu-andliquiddownflowinthedowncomer,leadingtoalarmodificationsofbubblecolumn.Themodificationswerewell-directedcirculationpattern.Ontheotherhand,spar-proposedtoovercometwomajorlimitations:(1)completegingindowncomerresultsinsubstantialincreasesinback-mixingintheliquidp
7、haseand(2)highpressuredrop.gas–liquidinterfacialarea,absorptionrateandareductionMoreover,thisclassofreactorisveryattractiveforuseinofpowerconsumptionperunitvolumeofthereactor.thechemicalprocessindustryandbiotechnologyduetoInspiteoffrequentuseofEL-ALR,presentdesignpr
