Drop Generated Vortex Rings

Shankar, PN and Kumar, Manoj (1994) Drop Generated Vortex Rings. Technical Report. National Aerospace Laboratories, Bangalore, India.

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A detailed experimental study has been made of the formation and gross motion of vortex rings generated when drops of water are allowed to come into contact with a quiescent water surface. In this case the vortex motion is driven principally by the drop surface energy. Using a video camera, measurements were made, over the whole trajectory, of the ring velocity, diameter and core thickness for three sizes of drops. Vortices generated by small drops reach higher peak velocities but decelerate more rapidly than ones generated by large drops. While the complex vortex generation mechanism appear, the same in all three cases, the vortex generated by the largest drop becomes turbulent before relaminarizing during deceleration. Perhaps the most interesting finding of the investigation was the discovery of a self limiting instability which manifests itself as oscillations in the ring velocity during deceleration.13; 13;

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Vortex rings;Toroidal
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Depositing User: Mr. Ravikumar R
Date Deposited: 23 May 2006
Last Modified: 24 May 2010 04:12
URI: http://nal-ir.nal.res.in/id/eprint/1558

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