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

Dooley, B. S. and Warncke, A. E. and Gharib, M. and Tryggvason, G. (1997) Vortex ring generation due to the coalescence of a water drop at a free surface. Experiments in Fluids, 22 (5). pp. 369-374. ISSN 0723-4864. doi:10.1007/s003480050062.

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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*∼L ^(3/2).

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Additional Information:© 1997 Springer-Verlag. Received: 22 December 1995; Accepted: 15 October 1996. This work was partially supported by the Office of Naval Research, ONR-URI N00014-92-J-1610. Additionally, the second author received scholarship support from the National Science Foundation. Special thanks are due to Mr. S. Haase for help with the construction of the experimental apparatus and Dr. P. Atsavapranee for assistance with the photography.
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Office of Naval Research (ONR-URI)N00014-92-J-1610
Issue or Number:5
Record Number:CaltechAUTHORS:20130912-100350776
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41281
Deposited By: Tony Diaz
Deposited On:12 Sep 2013 23:06
Last Modified:10 Nov 2021 04:28

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