An experimental technique for accelerating a single liquid droplet to high impact velocities against a solid target surface using a propellant gas

《An experimental technique for accelerating a single liquid droplet to high impact velocities against a solid target surface using a propellant gas 》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、ExperimentalThermalandFluidScience81(2017)202Ð208ContentslistsavailableatScienceDirectExperimentalThermalandFluidSciencejournalhomepage:www.elsevier.com/locate/etfsAnexperimentaltechniqueforacceleratingasingleliquiddroplettohighimpactvelocitiesagainstasolidt

2、argetsurfaceusingapropellantgasMahsaEbrahim⇑,AlfonsoOrtegaLaboratoryforAdvancedThermalandFluidSystems,VillanovaUniversity,Villanova,PA19085,USAarticleinfoabstractArticlehistory:TheliteratureofdropletimpingementprimarilyfocusesontherangeofimpactWebernumbersth

3、atcanReceived19April2016beachievedbyfree-fallingdroplets,bydropletspropelledtowardsasurfacebyelectro-mechanicalReceivedinrevisedform13July2016means,suchasthoseusedininkjetprinting,orbypressureatomization,asutilizedforexampleinsprayAccepted16October2016coolin

4、g.TherangeofWebernumberachievablebythesetechniquesis20

5、thiswork,alaboratoryKeywords:techniqueisdiscussedforproducingveryhighimpactvelocitiesforsmallliquiddropletsimpingingonaSpraycoolingsolidsurfacebyusingapropellantgas.Thedropletisinjectedintoagas(air)ßowinaconvergingnozzleDropletvelocityGasReynoldsnumberasiten

6、tersintoacirculartubeßow;thedropletisacceleratedbytheinternalgasßowandpropelledtowardsthetargetsurfacebythegasasitexitsthetubeandimpingesontothetargetsurface.For2mmwaterdroplets,impactWeashighas6000havebeenachieved,whicharefarinexcessofthosereportedinthelite

7、ratureinthefree-fallregime.BecauseoftheÞnitetubelength,thedropletsneverachievetheirtruerelativeterminalvelocity,butnonethelessaregreatlyacceleratedbythegasßow.Thedropletvelocityisfoundtovarylinearlywithgasvelocity.Ó2016PublishedbyElsevierInc.1.Introductionth

8、eexceptionofthestudybyStowandHadÞeld[16],inwhichthetargetsurfacewasacceleratedtowardsthefallingdropletinDropletimpingementhasnumerousapplicationsininkjetordertoincreasetherelativevelocityofthedr