Translational velocity oscillations of piston generated vortex rings

Kumar, M and Arakeri, JH and Shankar, PN (1995) Translational velocity oscillations of piston generated vortex rings. Physics of Fluids, 7 (11). pp. 2751-2756.

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Abstract

Experimental results are presented that show that the translational velocities of piston generated vortex rings often undergo oscillations, similar to those recently discovered for drop generated rings. An attempt has been made to minimize uncertainties by utilizing both dye and hydrogen bubbles for visualization and carefully repeating measurements on the same ring and on different realizations under the same nominal piston conditions. The results unambiguously show that under most conditions, both for laminar and turbulent rings and for rings generated from pipes and orifices, the oscillations are present. The result we have found is that oscillations in the translational velocity are always present at sufficiently high Reynolds numbers. In our opinion, this fact must be taken into account in any comprehensive theory or account of real vortex rings. (from Authors)

Item Type: Journal Article
Uncontrolled Keywords: Oscillation(Fluid; Vortex Rings;
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Other, Other, Computational and Theoretical Fluid Dynamics Division
Depositing User: Mr Vijaianand SK
Date Deposited: 10 Mar 2005
Last Modified: 24 May 2010 09:38
URI: http://nal-ir.nal.res.in/id/eprint/321

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