简介:Thereliabilityandaccuracyofnumericalresultsofmicroparticlefluidizationinaconicalbed,affectedsimultaneouslybymeshrefinement,thegridconfigurationandthewallboundarycondition(BC),areanalyzed.Specifically,pressuregradientsandvelocityprofilesoftitaniapowderarestudiedforaconicalbed.TheGidaspowdragcorrelationanddifferentwallBCsareconsideredusingaEulerian-Euleriantwo-fluidmodel.Predictionsofthepressurefluctuation,powerspectraofthecorrespondingpressurefluctuations,bedpressuredrop,minimumfluidizationvelocity,axialsolidvelocity,bedexpansionratio,andparticlesizedistributionarecomparedwithexperimentaldata.Meshsensitivityanalysisusinghexahedralandtetrahedralcellswithauniformmeshandnear-wallmeshrefinemenrisconductedtoinvestigatetheeffectsofmeshconfigurationsinestimatingparticleflowpatterns.Simulationsshowthatsignificantsavingsintermsofcomputationaltimearerealizedbychoosingauniformmeshwhilethehexahedralstructure,thenear-wallmeshrefinement,andthefree-slipBCgivetheclosestfittotheexperimentaldata.