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1、Availableonlineatwww.sciencedirect.comPowderTechnology184(2008)141–150www.elsevier.com/locate/powtecDiscreteelementmethodsimulationofthree-dimensionalconical-basespoutedbedsabb,⁎ShintaroTakeuchi,ShanWang,MartinRhodesaDepartmentofMechanicalEngineering,TheUniversityofTokyo,7-3-1Hongo,Bunkyo,Tokyo113-8
2、656JapanbDepartmentofChemicalEngineering,MonashUniversity,WellingtonRD.,Clayton,VIC3800AustraliaAvailableonline9January2008AbstractAdiscreteelementmethod(DEM)simulationofthree-dimensionalconical-basespoutedbedsispresented.Theoverallheightanddiameterofthevesselare0.5and0.15m,respectively,andthenozzle
3、diameteris0.02m.Theinclinedangleoftheconicalsectionvariesfrom0to60degrees.ThegasflowisdescribedbythecontinuityandNavier–Stokesequationsandsolvedbyafinitedifferencemethodofsecondorderaccuracyinspaceandtime.Forgas–particleinteraction,theErgunequation(forvoidfractionsmallerthan0.8)andtheWen-Yumodel(for
4、voidfractionof0.8andabove)areemployed.Anewmethodfortreatmentoftheboundaryconditionfor3-Dgasflowalongtheconesurfaceisproposed.Thisboundaryconditionsatisfiesboththecontinuityandmomentum-balancerequirementsforthegasphase.Usefulnessofthepresentsimulationforstudyinggasflowpatternandparticlemotioninconica
5、l-basespoutedbedsisdemonstrated.Theeffectsoftheinclinedangleanddrafttubeongasandparticleflowinspoutedbedsarediscussed.©2007ElsevierB.V.Allrightsreserved.Keywords:Spoutedbed;Conicalbase;Numericalsimulation;Discreteelementmethod;Drafttube;Fluidization1.Introductionregions(spoutandfountain)[2],whilecon
6、tactingofgasandsolidstakesplaceintheannulusregion.Spoutedbedsenablegoodmixingofparticlesandgas–Bothflatandconical-basespoutedbedshavebeenusedinparticlecontactingforrelativelylargeparticles.Thespoutedbedengineeringapplications.Flat-bottomedbedsareeasytosetup,techniquehasfoundapplicationsinchemicalpla
7、nt,biomassbuttheparticlesinthebottomregionoftheannulustendtoformprocessingplant,pharmaceuticalindustry,etc,fordrying,adeadzone.Theformationofadeadzonemayleadtoblending,coatingandgranulationofgranularm
