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Evolution of the ejecta sheet from the impact of a drop with a deep pool

Published online by Cambridge University Press:  14 October 2011

L. V. Zhang ,
J. Toole ,
K. Fezzaa  and
R. D. Deegan
L. V. Zhang
Affiliation:
Department of Physics, and Center for the Study of Complex Systems, University of Michigan, Ann Arbor, MI 48109, USA
J. Toole
Affiliation:
Department of Physics, and 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, and Center for the Study of Complex Systems, University of Michigan, Ann Arbor, MI 48109, USA
*
†Email address for correspondence: rddeegan@umich.edu
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Abstract

We used optical and X-ray imaging to observe the formation of jets from the impact of a single drop with a deep layer of the same liquid. For high Reynolds number there are two distinct jets: the thin, fast and early-emerging ejecta; and the slow, thick and late-emerging lamella. For low Reynolds number the two jets merge into a single continuous jet, the structure of which is determined by the distinct contributions of the lamella and the ejecta. We measured the emergence time, position and speed of the ejecta sheet, and find that these scale as power laws with the impact speed and the viscosity. We identified the origin of secondary droplets with the breakup of the lamella and the ejecta jets, and show that the size of the droplets is not a good indicator of their origin.

JFM classification

Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Drops
Type
Papers
Information
Journal of Fluid Mechanics , Volume 690 , 10 January 2012 , pp. 5 - 15
Copyright
Copyright © Cambridge University Press 2012

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