Study of particle atomization by breakup of water-drops using pulse combustion nozzle

Akira Michiwaki; Michihisa Tsutahara; Masayuki Hiraishi; Kentaro Mae; Kiyokazu Kominami; Yoshikuni Umeda; Atsunobu Kubotani

doi:10.1117/12.851390

14 April 2010 Study of particle atomization by breakup of water-drops using pulse combustion nozzle

Akira Michiwaki, Michihisa Tsutahara, Masayuki Hiraishi, Kentaro Mae, Kiyokazu Kominami, Yoshikuni Umeda, Atsunobu Kubotani

Author Affiliations +

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752218 (2010) https://doi.org/10.1117/12.851390
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

In this study, the pulse combustion is used to produce nanometer-size particle and the mechanism is clarified. The feature of jet generated by the pulse combustion chamber, whose pulse cycle is about 600 Hz, is visualized by the shadowgraph technique and is compared with that by the burner combustion. There exists very fine structure of vortices in the jet of pulse combustion. The water drop whose diameter is about 3mm is broken-up in this jet. This breakup does not occur in the jet of burner combustion. The droplets generated by the breakup are evaporated instantly and the nanometer-size particle is produced. Sound level in the jet is about 140 dB and sound power is not strong enough to promote the evaporation. Instead of sound, the very fine vortices, whose scale is of some mm, play an important role. These vortices give pressure fluctuation on the water droplet of 5000 Hz to 8000 Hz and they promote evaporation and deformation of the droplet.

Citation Download Citation

Akira Michiwaki, Michihisa Tsutahara, Masayuki Hiraishi, Kentaro Mae, Kiyokazu Kominami, Yoshikuni Umeda, and Atsunobu Kubotani "Study of particle atomization by breakup of water-drops using pulse combustion nozzle", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752218 (14 April 2010); https://doi.org/10.1117/12.851390

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