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

  • L. V. Zhang (a1), J. Toole (a1), K. Fezzaa (a2) and R. D. Deegan (a1)
Abstract
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.

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Email address for correspondence: rddeegan@umich.edu
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Present address: Engineering systems division, MIT, Cambridge, MA 02139, USA.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1. G. K. Batchelor 2000 An Introduction to Fluid Dynamics. Cambridge University Press.

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22. L. V. Zhang , J. Toole , K. Fezzaa & R. D. Deegan 2012 Evolution of the ejecta sheet from the impact of a drop with a deep pool. J. Fluid Mech. 690, 515.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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VIDEO
Movie

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.

 Video (5.8 MB)
5.8 MB
VIDEO
Movie

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.

 Video (395 KB)
395 KB

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