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时间:2020-03-28
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1、MassflowratemeasurementinheterogeneousdiphasicflowsbyusingtheslurrypumpsbehaviorS.Kouidri,,F.BakirandR.ReyLEMFI-UPRESACNRS7067ENSAM,Laboratoired’EnergétiqueetdeMécaniquedesFluidesInterne,151BoulevarddeL’Hôpital,75013,Paris,FranceReceived17May2000; revised10January2001;
2、 accepted22February2002. Availableonline26April2002.AbstractThisstudylieswithinthescopeofaEuropeanproject,withtheobjectiveofstudyinganddesigningatunnelboringmachineabletofunctionincontinuousmode.Thisoperatingmodeallowsreductionofdiscontinuitiesofexcavationinordertoobta
3、ingreaterefficiencybyreducingtheexcavationtime.Theextractionofrubbleiscarriedoutbymeansofahydrauliccircuitcomposedofasetofspecialpumpsforslurryandofahorizontalhydraulicpipe.Theoptimalcontrolofthewholeinstallation,pumpsincluded,requirescontinuousassessmentofthemassflowr
4、ateofthesolid–liquidmixture.Duringthisstudy,weaimedtodevelopamethodologyofmassflowratemeasurementtoreplacetheexistinglimitedmethodofgamma-densitometer,astheirregularitiesnoticedduringvariousphasemeasurementreducethereliabilityofthistechnique.Thispaperpresentsatheoretic
5、alandexperimentalstudywhichwillmakeitpossibletoimprovetheaccuracyofmeasurementcarriedoutbythegamma-densitometerandthedevelopmentofamethodbasedonthepowerconsumedbytheenginesdrivingthepumps.AuthorKeywords:Gamma-densitometer;Flowrate;PumpCvolumetricconcentrationofsolidCDd
6、ragcoefficientDpipediameterdparticlesdiameterHslurryheadgaccelerationofgravityLpipelengthPabsshaftpowerqvflowrateRepReynoldsnumberR(z)meansradiusSsolid/liquiddensityratioRextextemalradiusoftheimpellerVCminimumbuildingbedflowvelocityVHminimumhomogeneousflowvelocityVSmin
7、imumheterogeneousflowvelocityΩangularspeedΦpressurecoefficientρflowratecoefficientηefficiencyτpowercoefficientαradiationbeamanglewithhorizontalνkinematicviscosityμabsorptionfactorρdensityIliquidmmixturessolidArticleOutlineNomenclature1.Introduction2.Thegamma-densitomet
8、erwithasinglebeam2.1.Influenceoftheinclinationofthedevice2.2.Influenceofthekindofflow2.2.1.Differentkindsofflows2.2.2
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