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Titolo:
Visualization of high-speed gas jets and their airblast sprays of cross-injected liquid
Autore:
Kihm, KD; Kim, TK; Son, SY;
Indirizzi:
Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 h Engn, College Stn, TX 77843 USA
Titolo Testata:
EXPERIMENTS IN FLUIDS
fascicolo: 1, volume: 27, anno: 1999,
pagine: 102 - 106
SICI:
0723-4864(199906)27:1<102:VOHGJA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCATTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Kihm, KD Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 ollege Stn, TX 77843 USA
Citazione:
K.D. Kihm et al., "Visualization of high-speed gas jets and their airblast sprays of cross-injected liquid", EXP FLUID, 27(1), 1999, pp. 102-106

Abstract

A planar and instantaneous visualization study of high-speed gas jets and their airblast sprays was performed to qualitatively examine the different atomization performances of different gas nozzles. For the visualization ofhigh-speed gas jets (with no liquid injected), Nd:YAG pulsed laser sheets imaged the clustered vapor molecules in the Rayleigh range (d much less than lambda), condensed from the natural humidity during the isentropic gas expansion through a nozzle. This method visualized both underexpanded sonic gas jets from a converging nozzle (SN-Type) and overexpanded supersonic gas jets from a converging-diverging nozzle (CD-Type). When liquid is cross-injected, the same laser sheet images the spray droplets of relatively large sizes (d greater than or equal to lambda). The present visualization resultsshow that the SN-Type nozzle develops a wider spray than the CD-Type nozzle, quite probably because the SN-Type nozzle has a wider gas jet tin the absence of liquid) than the CD-Type. Also, the wider spray of the SN-Type nozzle lowers the probability of droplet coalescence and generates finer sprays compared to the CD-Type nozzle. These visualization results qualitativelyagree with the previous quantitative finding of the different atomization characteristics of the two types of nozzles (Park et al. 1996).

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Documento generato il 02/04/20 alle ore 17:56:12