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Fundamentals of Dynamics and Evaporation in Clusters of Drops Embedded into Vortices

Bellan, Josette (1996) Fundamentals of Dynamics and Evaporation in Clusters of Drops Embedded into Vortices. In: Recent Advances in Spray Combustion: Spray Atomization and Drop Burning Phenomena. Progress in Astronautics and Aeronautics. No.166. American Institute of Aeronautics and Astronautics , Reston, VA, pp. 381-397. ISBN 978-1-56347-175-9. http://resolver.caltech.edu/CaltechAUTHORS:20171027-132428140

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Abstract

Drops in vortices are an inherent feature of a spray whether a spray is combusting or not. The clustering of injected drops into round jets has been observed by Longmire and Eaton; each cluster remains embedded in a coherent vortex. The train of these vortices forms the shear layer at the edge of the jet. Clustering of drops in sprays has also been observed by McDonell et al. in both cold flows and combusting sprays and by Rudoff et al. Recently, Mizutani et al. confirmed the previous observation of Allen and Hanson, who identified closed-surface flames surrounding portions of space much larger than individual drops; these flames presumably enclosed clusters of drops. It is obvious that for drops to be clustered in a convective environment, there must be a fluid dynamical feature which maintains them in a cluster. Since vortices occur in all flows of practical interest, it is only natural to assume that drops embedded in vortices form entities of crucial interest in sprays. This chapter is devoted to describing formulations of clusters of drops in vertical flows. Further, it is also explained how there entities can be used to portray spray shear layers and how results obtained with such models can aid in the qualitative understanding of the layers. Finally, conclusions are presented summarizing the significance of the results and pointing to further directions for this work.


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https://doi.org/10.2514/5.9781600866418.0381.0397 DOIArticle
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Deposited By: Tony Diaz
Deposited On:27 Oct 2017 20:42
Last Modified:27 Oct 2017 20:42

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