vortex ring(redirected from Hill's vortex)
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Related to Hill's vortex: Vortex ring
vortex ring[′vȯr‚teks ‚riŋ]
A line vortex in which the line of concentrated vorticity is a closed curve. Also known as collar vortex; ring vortex.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.