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1、ExperimentalThermalandFluidScience81(2017)202D208ContentslistsavailableatScienceDirectExperimentalThermalandFluidSciencejournalhomepage:www.elsevier.com/locate/etfsAnexperimentaltechniqueforacceleratingasingleliquiddroplettohighimpactvelocitiesagainstasolidt
2、argetsurfaceusingapropellantgasMahsaEbrahim?,AlfonsoOrtegaLaboratoryforAdvancedThermalandFluidSystems,VillanovaUniversity,Villanova,PA19085,USAarticleinfoabstractArticlehistory:TheliteratureofdropletimpingementprimarilyfocusesontherangeofimpactWebernumbersth
3、atcanReceived19April2016beachievedbyfree-fallingdroplets,bydropletspropelledtowardsasurfacebyelectro-mechanicalReceivedinrevisedform13July2016means,suchasthoseusedininkjetprinting,orbypressureatomization,asutilizedforexampleinsprayAccepted16October2016coolin
4、g.TherangeofWebernumberachievablebythesetechniquesis205、thiswork,alaboratoryKeywords:techniqueisdiscussedforproducingveryhighimpactvelocitiesforsmallliquiddropletsimpingingonaSpraycoolingsolidsurfacebyusingapropellantgas.Thedropletisinjectedintoagas(air)?owinaconvergingnozzleDropletvelocityGasReynoldsnumberasiten
6、tersintoacirculartube?ow;thedropletisacceleratedbytheinternalgas?owandpropelledtowardsthetargetsurfacebythegasasitexitsthetubeandimpingesontothetargetsurface.For2mmwaterdroplets,impactWeashighas6000havebeenachieved,whicharefarinexcessofthosereportedinthelite
7、ratureinthefree-fallregime.BecauseoftheTnitetubelength,thedropletsneverachievetheirtruerelativeterminalvelocity,butnonethelessaregreatlyacceleratedbythegas?ow.Thedropletvelocityisfoundtovarylinearlywithgasvelocity.ó2016PublishedbyElsevierInc.1.Introductionth
8、eexceptionofthestudybyStowandHadTeld[16],inwhichthetargetsurfacewasacceleratedtowardsthefallingdropletinDropletimpingementhasnumerousapplicationsininkjetordertoincreasetherelativevelocityofthedr
