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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

INSTABILITY ANALYSIS OF A LIQUID JET INJECTED FROM COAXIAL DUAL NOZZLE

T. Suzuki
Toyohashi University of Technology, Japan

Kenji Amagai
Department of Mechanical System Engineering, Gunma University, Kiryu, Gunma, Japan

Masataka Arai
Division of Mechanical Science and Technology, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376-8515, Japan; Tokyo Denki University

Hiroyuki Hashimoto
Institute of Fluid Science, Tohoku University, Sendai, Japan

Koshi Mitachi
Department of Mechanical Engineering, Toyohashi University of Technology 1-1, Hibarigaoka, Tempaku-cho, Toyohashi 441, Japan

Abstract

A short wave was observed on the interface of liquid jet which was injected from the coaxial dual nozzle into a co-current gas stream. This wave promoted the breakup of liquid jet. To clarify the inception mechanism of the short wave, the internal instability of liquid jet flow was analyzed numerically. It was shown that the short wave was mainly due to the internal disturbance within liquid jet which rose from the internal instability. The effect of liquid injection velocity ratio, the diameter ratio of the coaxial dual nozzle and the liquid properties upon the instability were examined numerically. Finally, it was found that the breakup of the coaxial liquid jet could be controlled by appropriate adjustment of these parameters.