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外文翻译--评估旋风分离器效率新方法的改进 英文版.pdf

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外文翻译--评估旋风分离器效率新方法的改进 英文版.pdf

CHEMICALENGINEERINGANDPROCESSING442005447–451ABSTRACTSEPARATIONRADIALGRADETHEK1LUTIONANDRICATE,HARSHMOSTUTILIZEDOFTRIBTIONSOFORIESETRAINCOLLECTIONRIESPARTICLES,GALDEVELOPMENTOFANEWMETHODFOREVALUATINGCYCLONEEFFICIENCYBINGTAOZHAO∗DEPARTMENTOFENVIRONMENTALENGINEERING,DONGHUAUNIVERSITY,NO1882WESTYAN’ANROAD,SHANGHAI200051,PRCHINARECEIVED29MARCH2004;RECEIVEDINREVISEDFORM9JUNE2004;ACCEPTED15JUNE2004AVAILABLEONLINE20AUGUST2004ANEWTHEORETICALMETHODFOREVALUATINGCYCLONEEFFICIENCYISDEVELOPEDBASEDONTHEINVESTIGATIONOFFLOWPATTERN,THECRITICALPARTICLESIZETHEORYANDTHEBOUNDARYLAYERSEPARATIONTHEORYTHERADIALPARTICLECONCENTRATIONGRADIENT,INSTEADOFTHEUSUALLYASSUMEDUNIFORMPARTICLECONCENTRATIONWITHINTHECYCLONE,ISCONSIDEREDINTHISMATHEMATICALMODELTHELOCALPARTICLECONCENTRATIONANDTHECYCLONEEFFICIENCYCANBECALCULATEDONTHEBASEOFATIMEOFFLIGHTMODELINTERMSOFTHEPARTICLESIZEDISTRIBUTIONOFTHEFEEDTHEAVAILABILITYOFMETHODISVERIFIEDBYCOMPARISONOFTHECALCULATEDGRADEEFFICIENCYWITHEXPERIMENTALDATAANDTHEORETICALCOUNTERPARTSINTHELITERATUREEYWORDSCYCLONE;COLLECTIONEFFICIENCY;MATHEMATICALMODELINTRODUCTIONCYCLONESEPARATORSAREWIDELYUSEDINTHEFIELDOFAIRPOLANYPARTICLESIZEISDETERMINEDFROMTHERATIOOFITSSETTLINGVELOCITYTOTHETERMINALSETTLINGVELOCITYOFTHESTATICPARTICLEDIRGOANDLEITH3MODIFIEDTHEBARTHTHEORYANDFOUNDCONTROLANDGASSOLIDSEPARATIONFORAEROSOLSAMPLINGINDUSTRIALAPPLICATIONSDUETORELATIVESIMPLICITYTOFABLOWCOSTTOOPERATE,ANDWELLADAPTABILITYTOEXTREMELYCONDITIONS,CYCLONESEPARATORSHAVEBECOMEONEOFTHEIMPORTANTPARTICLEREMOVALDEVICESWHICHAREPREFERABLYINBOTHENGINEERINGANDPROCESSOPERATIONINORDERTODESCRIBETHECYCLONEPERFORMANCE,THETHEORIESCYCLONEPARTICLECOLLECTIONAREDEVELOPEDBYMANYCONUTORSUSINGDIFFERENTMETHODSWITHSIMPLIFYINGASSUMPREPRESENTATIVERESEARCHESMAINLYINCLUDETHETHEORYLAPPLE1ISTHEMOSTWIDELYUSEDEXAMPLEOFTHECUTTHELAPPLEASSUMEDTHATPARTICLESENTERINGTHECYCLONEAREVENLYDISTRIBUTEDACROSSTHEINLETOPENINGTHEPARTICLETHATVELSFROMTHEINLETHALFWIDTHTOTHEWALLDURINGTHETIMETHECYCLONEISCOLLECTEDWITH50EFFICIENCYBARTH’S2THEORYISANOTHERREPRESENTATIONOFCUTSIZETHEOBARTHCALCULATEDTHETERMINALSETTLINGVELOCITYFORSTATICBASEDONTHEEXACTBALANCEBETWEENTHECENTRIFUFORCEANDTHEDRAGFORCETHECOLLECTIONEFFICIENCYFOR∗TEL862162373718;FAX862162373482EMAILADDRESSZHAOBINGTAOMAILDHUEDUCNBZHAOACIENCLAPPLE’DESCRIBETRIESCADJUSTMENTLICHTDESIGNTRATIONALLOPARTICLESUNFORTUNATELYFDIRECTIONTHECIENCANDOCCURS,MANDIETZRESIMPLEEXPRESSIONFORBARTH’SPLOTOFTHECOLLECTIONEFFIYVERSUSTHERATIOIOZIAANDLEITH4,BASEDONTHESANDBARTH’STHEORY,PROPOSEDALOGISTICFUNCTIONTOTHEFRACTIONALEFFICIENCYFORCYCLONESWITHGEOMEWHICHWEREVARIATIONSOFTHESTAIRMANDHIGHEFFICIENCYYCLONETHISEQUATIONHASANEMPIRICALPARAMETERTHATALLOWSOFTHESHARPNESSOFTHECUTOFCYCLONELEITHAND5DEVELOPEDANOTHERPOPULARAPPROACHFORCYCLONEASSUMINGTHATTURBULENCEKEEPSTHEPARTICLECONCENATANYHEIGHTINTHECYCLONEWELLMIXEDTHETHEORYWSADIRECTCALCULATIONOFTHECOLLECTIONEFFICIENCYFOROFANYSIZEANDCYCLONESOFARBITRARYDESIGNBUT,THEREISEXPERIMENTALEVIDENCETOSUPPORTTHEACTTHATTHEREIS,INDEED,ACONCENTRATIONGRADIENTINTHERADIALOFCYCLONESCLIFTETAL6MODIFIEDTHEESTIMATEOFMEANGASRESIDENCETIMEANDREDERIVEDTHEGRADEEFFIYEQUATIONBASEDONTHEORIGINALASSUMPTIONSOFLEITHLICHT’STHEORYANDADIFFERENTDEPENDENCEONPARTICLESIZEAPPROACHINGTHETYPICALSSHAPECURVESOBTAINEDBYYRESEARCHERSAHYBRIDCOLLECTIONTHEORYDEVELOPEDBY7DIVIDESTHECYCLONEINTOTHREEREGIONSTHEENTRANCEGION,THEDOWNFLOWORANNULARREGION,ANDTHEUPFLOW448ANDPRORCLESASSUMEDTRATIONTHISLENTGIONEFMOREAWPRESENTCDIFDIFOGNIZINGINTHEKIMCLONESORYANDLENTTHEGIONFROMANOTHER11,12THEORYROUGHNESS,SIZEANDMETHOD13DICTINGTIGATIONTHEORYSIDERSOFTICLESBY2INMININGAREPARTICLETICLE,SAMENE21GASflOWPATTERNANDPARTICLEMOTION211GASflOWPATTERNTHECIRCUMFERENTIALGASVELOCITYPROFILEFOREFFECTIVESEPARATIONREGIONRE≤R≤RWWASOBTAINEDBYMOTHESANDLOFFLER8,WITHSIMPLIFYINGTHECYCLONETOTHERIGHTCYLINDERANDCONSIDERINGTHEWALLROUGHNESSASFOLLOWSVΘVΘWR/RW1P1−R/RW1VΘWVDΞH∗PARENLEFTBIGGRADICALBIGG14ΞH∗V∗ΘWVD−12PARENRIGHTBIGG2V∗VΠR2W3BZHAO/CHEMICALENGINEERINGCOREREGIONDIETZPROPOSEDTHEINTERCHANGEOFPARTIBETWEENTHEANNULARANDCOREREGIONSBUTDIETZALSOTHATTURBULENCEPRODUCESAUNIFORMRADIALCONCENPROFILEFORUNCOLLECTEDPARTICLESWITHINEACHREGIONASSUMPTIONASWELL,SHOULDBEJUSTIFIEDMOTHESANDOFFLER8HAVEEXTENDEDTHECONCEPTSOFDIETZOFDIFFERFLOWREGIONSWITHINTHECYCLONETOINCLUDEAFOURTHRECLOSETOTHEDUSTEXITATTHECYCLONEBOTTOM,WHERETHEFECTOFDUSTREENTRAINMENTCANBEINCLUDEDINPRINCIPLEIMPORTANT,HOWEVER,SEEMSTOBETHECONSIDERATIONOFFINITETURBULENTDIFFUSIVITYINBOTHTHEDOWNWARDANDUPARDFLOWREGIONSTHISAPPROACHAVOIDSTHEDISCONTINUITIESINTHEDIETZMODELANDTHETRANSPORTOFPARTICLESINYCLONESEPARATORSISTHENVIEWEDASASUPERIMPOSITIONOFAFUSIVEMOTIONWITHADETERMINISTICMEANMOTIONOTHERFERENTTHEORIESINCLUDELIANDWANG9ALTHOUGHRECTHEROLEOFAFINITETURBULENTPARTICLEDIFFUSIVITYPRODUCINGRADIALCONCENTRATIONGRADIENTS,HAVEDROPPEDHYPOTHESISOFDIFFERENTFLOWREGIONSWITHINACYCLONEANDLEE10PROPOSEATHEORYFORHIGHEFFICIENCYCYBASEDONTHEBOUNDARYLAYERCHARACTERISTICSTHISTHEDIVIDESTHECYCLONEINTOTWOREGIONS,THETURBULENTREGIONTHENEARWALLREGIONPARTICLESTRAJECTORIESINTHETURBUREGIONWERECALCULATEDFROMTHEMEANFLUIDMOTIONANDCOLLECTIONPROBABILITYOFPA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