Translational velocity oscillations of piston generated vortex rings

Kumar, Manoj ; Arakeri, J. H. ; Shankar, P. N. (1995) Translational velocity oscillations of piston generated vortex rings Physics of Fluids, 7 (11). pp. 2751-2756. ISSN 1070-6631

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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 present results, together with the earlier results on drop generated rings, give support to the view that translational velocity oscillations are probably an inherent feature of translating vortex ring fields.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Flow Visualization; Laminar Flow; Oscillations; Pistons; Turbulent Flow; Vortex Flow
ID Code:53005
Deposited On:04 Aug 2011 12:09
Last Modified:03 Jul 2012 09:12

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