欢迎来到天天文库
浏览记录
ID:40082032
大小:1.10 MB
页数:16页
时间:2019-07-20
《Investigation of Particle Trajectories in 2-Phase Flow Systems》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、J.FluidMe&.(1972),vol.55,paTt2,pp.193-208193Printedin@eatBritainAninvestigationofparticletrajectoriesintwo-phaseflowsystemsByS.A.MORS1DepartmentofMechanicalEngineering,UniversityofSurreyANDA.J.ALEXANDERLoughboroughUniversityofTechnology(Received12November1971)Thispaperdescribesatheo
2、reticalinvestigationinto(i)theresponseofasphericalparticletoaone-dimensionalfluidflow,(ii)themotionofasphericalparticleinauniformtwo-dimensionalfluidflowaboutacircularcylinderand(iii)themotionofaparticleaboutaliftingaerofoilsection.Inallthreecasesthedragoftheparticleisallowedtovaryw
3、ith(instantaneous)Reynoldsnumberbyusingananalyticalapproximationtothestandardexperimentaldrag-Reynolds-numberrelationshipforsphericalparticles.1.IntroductionThepredictionofparticlevelocitiesandtrajectoriesinfluidflowisofacon-siderableimportanceinmanyfields.Instudyingtheerosiondamage
4、sustainedbynozzlesorbladesinsteamorgasturbines,wherethesepartsaresubjectedtotheflowofamixtureofgasandsolidsorgasandwaterdrops,Martlew(1960)andNeilson&Gilchrist(1968)havefoundthattheerosiondependsonthewallmaterial,theparticlevelocityandtheangleofattack.Similarly,inthedesignofinertiaa
5、ndimpingementfilters,thepredictionofparticletrajectorieswillbeofgreathelpinassessingtheefficiencyofthesefiltersincapturingsolidparticlesfromthecarrierfluid.Inthecaseofflowthroughaturbineitisdesirableforparticlesnottocontactthebladeswhereasinflowthroughafiltertheoppositeeffectisneede
6、d.Ineithercaseitisnecessarytoknowwhatpathaparticlewilltakeandalthoughcalcula-tionshavebeenmadebyLangmiur&Blodgett(1946)andMichael&Norey(1969),itisusualtoassumethattheparticleReynoldsnumberissmallandthattheStokeslinearapproximationtothedragcoeficient(C,=24/RN)willbevalid.Thisisnotalw
7、aysthecaseandatsufficientlyhighReynoldsnumbersverylargeerrorswillresultfromtheuseofthisformula.Inthispaperanexpressionforthedragcoefficientwhichcloselyapproximatestothestandardexperimentaldrag-Reynolds-numberrelationshipisusedtogiveananalyticalsolutioninthecaseofone-dimensionalflowa
8、ndtosavecomputation
此文档下载收益归作者所有