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‘Effervescent’ atomization in two dimensions

Published online by Cambridge University Press:  02 January 2013

H. Lhuissier and
E. Villermaux
H. Lhuissier*
Affiliation:
Aix-Marseille Université, IRPHE, 13384 Marseille CEDEX 13, France
E. Villermaux
Affiliation:
Aix-Marseille Université, IRPHE, 13384 Marseille CEDEX 13, France
*
†Email address for correspondence: h.e.lhuissier@utwente.nl
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Abstract

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A planar Savart water sheet uniformly seeded with small air bubbles in a large surface concentration is studied as a model experiment of the so-called ‘effervescent’ atomization process. This two-dimensional setup allows for a quantitative observation of all the steps of the sheet’s disintegration into a collection of disjointed droplets. The bubbles are heterogeneous nucleation sites which puncture the sheet with holes. The dynamics of the opening of holes competes with the simultaneous nucleation rate of new holes in a statistically stationary fashion. The liquid constituting the sheet is then transiently concentrated in a web of ligaments of various lengths and diameters, at the junction between adjacent holes. Their breakup produces the final spray. We provide a complete description of the ligament web statistics when nucleation is synchronous, and we show that the drop size dispersion from the breakup of a single ligament is responsible for the shape of the overall spray drop size distribution.

JFM classification

Drops and Bubbles: Breakup/coalescenceDrops and Bubbles: Drops and BubblesInterfacial Flows (free surface): Interfacial Flows (free surface)

Information

Type
Papers
Information
Journal of Fluid Mechanics , Volume 714 , 10 January 2013, pp. 361 - 392
Copyright
©2013 Cambridge University Press

Footnotes

‡

Also at Institut Universitaire de France.

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