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Vortex ring formation at tube and orifice openings

Pullin, D. I. (1979) Vortex ring formation at tube and orifice openings. Physics of Fluids, 22 (3). pp. 401-403. ISSN 1070-6631. doi:10.1063/1.862606.

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The formation, at tube and orifice openings, of vortex rings generated by a piston moving with velocity proportional to time to some power m, is considered. The expansion of the axisymmetric generating flow about the circular forming edge is used in conjunction with the similarity theory of edge vortex growth to model the ring formation process. For large Reynolds numbers the ring diameter and circulation are not strongly dependent on the piston velocity profile. However, the ring viscous subcore shows peaks in the tangential velocity profile only if m < (π–θ)/(2π–θ), where θ is the edge forming angle.

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Additional Information:Copyright © 1979 American Institute of Physics. Received 12 June 1978.
Issue or Number:3
Record Number:CaltechAUTHORS:PULpof79
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4159
Deposited By: Tony Diaz
Deposited On:07 Aug 2006
Last Modified:08 Nov 2021 20:15

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