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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)

VORTEX PAIRING AND DROPLET DISPERSION IN A TWO-DIMENSIONAL, TURBULENT SPRAY

K.T. Kiger
University of California San Diego, USA

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

Abstract

An experimental characterization of the entrainment and transport of small droplets in a turbulent, plane mixing layer is presented. Specifically, this study addresses the contribution of vortex pairing to the dispersion process. The experimental data was obtained using optical measurements that allowed for the characterization of mean, r.m.s., and conditional-averaged profiles of attenuation in addition to the conditional-averaged evolution of the dispersed-phase number frequency and velocity for the various sized droplets. It is shown that the pairing process resulting from the combination of harmonic and subharmonic forcing contributes to an increased rate of homogenization of the droplet concentration across the mixing layer when compared to the case of single frequency forcing. The amount of homogenization depends strongly on the history of the flow and the size of the particulate.