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Experiments in Fluids

, Volume 22, Issue 5, pp 369–374 | Cite as

Vortex ring generation due to the coalescence of a water drop at a free surface

  • B. S. Dooley
  • A. E. Warncke
  • M. Gharib
  • G. Tryggvason

Abstract

 Results are presented of an experimental investigation of vortex ring formation by a fluid drop contacting a free surface with negligible velocity. The pool fluid is mixed with fluorescein dye, and a laser sheet is used to illuminate a plane of the flow. A series of representative images is recorded by a CCD camera and speculation is made regarding specific sources of vorticity flux through the free surface. Two scaling analyses previously presented by other investigators are demonstrated to be equivalent under the assumptions of this experiment, and they provide the motivation for a series of test runs in which the duration of the coalescence process, τ*, is related to variations in drop diameter L and fluid surface tension σ. Experimental results are in agreement with the analyses, showing τ*∼σ-1/2 and τ*L3/2.

Keywords

Surface Tension Vorticity Free Surface Vortex Ring Water Drop 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • B. S. Dooley
    • 1
  • A. E. Warncke
    • 1
  • M. Gharib
    • 1
  • G. Tryggvason
    • 2
  1. 1.Graduate Aeronautical Laboratories 205-45, California Institute of Technology, Pasadena, CA 91125, USAUS
  2. 2.Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109, USAUS

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