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Splashing from drop impact into a deep pool: multiplicity of jets and the failure of conventional scaling

Published online by Cambridge University Press:  05 July 2012

L. V. Zhang ,
J. Toole ,
K. Fezzaa  and
R. D. Deegan
L. V. Zhang
Affiliation:
Department of Physics & Center for the Study of Complex Systems, University of Michigan, Ann Arbor, MI 48109, USA
J. Toole
Affiliation:
Department of Physics & Center for the Study of Complex Systems, University of Michigan, Ann Arbor, MI 48109, USA
K. Fezzaa
Affiliation:
X-Ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
R. D. Deegan*
Affiliation:
Department of Physics & Center for the Study of Complex Systems, University of Michigan, Ann Arbor, MI 48109, USA
*
†Email address for correspondence: [email protected]
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Abstract

We report high-speed optical and X-ray observations of jets formed during the impact of a drop with a deep pool of the same liquid. We show that a scaling that relies entirely on liquid properties, as is conventionally employed, is insufficient to determine the threshold for splashing. In order to determine if the gas properties could account for this deficit, we conducted experiments with different surrounding gases. We find that the splashing threshold depends on the gas’s dynamic viscosity, but not its density. We argue that these results are consistent with a thickening of the ejecta caused by the bubble trapped on impact between the drop and the pool. We also show that drop impact can generate a third jet, distinct from the lamella and the ejecta, that produces secondary droplets of an intermediate size.

JFM classification

Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Drops Instability: Nonlinear instability
Type
Papers
Information
Journal of Fluid Mechanics , Volume 703 , 25 July 2012 , pp. 402 - 413
Copyright
Copyright © Cambridge University Press 2012

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Footnotes

‡

Present address: Engineering systems division, MIT, Cambridge, MA 02139, USA.

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Zhang et al. supplementary movie

High-speed X-ray movie of a drop of a water-glycerol mixture impacting on a pool of the same liquid at We=228 and Re=4540.

Download Zhang et al. supplementary movie(Video)
Video 5.8 MB

Zhang et al. supplementary movie

High-speed X-ray movie of a drop of a water-glycerol mixture impacting on a pool of the same liquid at We=228 and Re=4540.

Download Zhang et al. supplementary movie(Video)
Video 394.7 KB