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Formation of vortex rings from falling drops

Published online by Cambridge University Press:  28 March 2006

David S. Chapman  and
P. R. Critchlow
David S. Chapman
Affiliation:
Department of Physics, University of British Columbia, Vancouver, Canada
P. R. Critchlow
Affiliation:
Department of Physics, University of British Columbia, Vancouver, Canada
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Abstract

A study of the formation of vortex rings when a liquid drop falls into a stationary bath of the same liquid has been made. The investigation covered liquids with a wide range in surface tensions, densities and viscosities. The results confirm the reported existence of optimum dropping height from which the drop develops into a superior vortex ring. The optimum heights are analysed, by a photographic study, in terms of the liquid drop oscillation. It is found that vortex rings are formed best if the drop is spherical and changing from an oblate to a prolate spheroid at the moment of contact with the bath. A Reynolds number has been determined for vortex rings produced at optimum dropping heights; these numbers are approximately 1000. A possible mechanism for the ring formation is suggested.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 29 , Issue 1 , 18 July 1967 , pp. 177 - 185
Copyright
© 1967 Cambridge University Press

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References

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