第23卷第2期2023年2月过程工程学报TheChineseJournalofProcessEngineeringVol.23No.2Feb.2023Discretemodelingoftheend-walleffectonparticleaxialmovementinhorizontaldrumXingkunWANG1,XuhuiZHANG1,HuiGUO2,3,XiaoxingLIU2,3*1.BeijingGuodianFutongScienceandTechnologyDevelopmentCo.,Ltd.,Beijing100070,China2.StateKeyLaboratoryofMultiphaseComplexSystems,InstituteofProcessEngineering,ChineseAcademyofSciences,Beijing100190,China3.SchoolofChemicalEngineering,UniversityofChineseAcademyofSciences,Beijing100049,ChinaAbstract:Aimingattheshortdrumsysteminwhichonlyoneendfacecanrotatewiththesidewallintheslagcrushingprocess,thediscreteelementmethod(DEM)isusedtosimulateandstudytheinfluenceofthedrumlength-diameterratioandrotationspeedontheaxialflowcharacteristicsofgranularmaterials.Simulationresultsindicatethatdistinctaxialconventionoccursinsidethesystem:particlesintheupstreamzonetendtomovetowardsthefixedend-wallside,whereasthoseinthedownstreamzoneareapttoshifttowardstherotatingend-wallside.Atlowrotatingspeedcondition,alongthetransversedirectiontheaxialvelocityprofileofparticlesatthefreesurfacepresentsanasymmetriccharacteristic.Theaxialvelocitymagnitudeofparticlesintheupstreamzoneisclearlysmallerthanthatofparticlesinthedownstreamzone.Theaxialvelocitymagnitudeofparticlesinthetwozonesreachesthemaximumvalueaty/R=±0.725,andthepositionwheretheaxialvelocityis0doesnotappearinthetangentialmiddleposition.Suchasymmetriccharacteristicisnearlyindependentontheaxiallengthofthedrum,whereasincreasingtherotationalspeedofthedrumwillincreasetheaxialvelocityoftheparticlesandgraduallyreducethisasymmetry.Changingtherotatingspeedofthedrumhasagreatereffectontheaxialflowofparticlesintheupstreamzoneofthematerialthanontheaxialflowofparticlesinthedownstreamzone.Whenthelength-diameterratioofthedrumreaches1.2,theinfluenceareaoftherotatingend-wallontheaxialflowofthematerialwillnotchangesignificantlywiththeincreaseoftherotatingspeedofthedrum.Thesimulationresultsthusprovidehelpfulguidelinesforthefutureoptimizationofthereald...
