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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)

BREAKUP OF A WATER JET IN HIGH VELOCITY CO-FLOWING AIR

E.J. Hopfinger
LEG/IMG, CNRS & UJF, Grenoble, France

Juan C. Lasheras
Department of Mechanical & Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, USA

Abstract

Flow visualizations by high speed cameras of the disintegration of a liquid (water) jet in a high-velocity co-axial gas (air) jet allowed the classification of breakup regimes according to the Weber number and momentum ratio. A momentum criterion for the pinch-off of the liquid core and the onset of a superpulsating mode is proposed. Drop size measurements in the high momentum ratio show a dependence of the drop size on the inverse square of the gas velocity suggesting a secondary breakup mechanism.