简介：Weappliedthediscreteelementmethod(DEM)ofsimulationmodifiedbyanenlargedparticlemodeltosimulatebeadmotioninalargebeadmill.Thestainless-steelbeadmillhasinnerdiameterof102mmandmilllengthof198mm.Thebeaddiameterandfillingratiowerefixedrespectivelyat0.5mmand85%.Theagitatorrotationalspeedwaschangedfrom1863to3261rpm.Thebeadmotionwasmonitoredexperimentallyusingahigh-speedvideocamerathroughatransparentmillbody.Forthesimulation,enlargedparticlesizesweresetas3-6mmindiameter.WiththeDEMmodifiedbytheenlargedparticlemodel,themotionofenlargedparticlesinamillwassimulated.Thevelocitydataofthesimulatedenlargedparticleswerecomparedwiththoseobtainedintheexperiment.ThesimulatedvelocityoftheenlargedparticlesdependsonthevirtualfrictionalcoefficientintheDEMmodel.Theoptimizedvalueofthevirtualfrictionalcoefficientcanbedeterminedbyconsideringtheaccumulatedmeanvalue.Resultsshowthatthevelocityoftheenlargedparticlessimulatedincreaseswithanincreaseintheoptimumvirtualfrictionalcoefficient,butthesimulatedvelocityagreeswellwiththatdeterminedexperimentallybyoptimizingthevirtualfrictionalcoefficientinthesimulation.Thecomputingtimeinthesimulationdecreaseswithincreasedparticlesize.
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