vortex ring


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vortex ring

[′vȯr‚teks ‚riŋ]
(fluid mechanics)
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.
References in periodicals archive ?
Choose from four customizable fluidic forces and behaviors, including Vortex Ring, Vortex Tube, and more.
The velocity induced by a typical vortex ring at an arbitrary point can be calculated by applying the Biot-Savart law to the ring's four segments, except for the rings located at the trailing edge of the wing.
Helmholtz called these vortex tubes returning into themselves vortex rings (cf.
"The pilot considered he then entered a Vortex Ring situation and due to the low altitude was unable to recover before the helicopter landed heavily."
"This is really uncomfortable; I'm going to descend back under the clouds," was the last sentence I spoke before entering into vortex ring state.
But program officials and engineers believe they now have a handle on Vortex Ring State (VRS).
The vortex ring is a rotating ring of fluid moving stably through the body of the liquid - analogous to a smoke ring moving through the air.
Several authors (15-19) studied non-Newtonian fluid flow in a tube with a sudden expansion and found that there exists a vortex ring around the axis in the expansion side, the shear-thinning will cause the vortex to grow (15, 16), but the fluid elasticity will reduce the size of the vortex (17-19).