vortex ring


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vortex ring

n
(General Physics) a stable perturbation in a fluid that takes the form of a torus in which the flow rotates in the section of the torus so that the pressure difference between the inside and outside of the torus balances body forces. The best-known vortex ring is a smoke ring
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Choose from four customizable forces and behaviors, including Vortex Ring, Vortex Tube, and more.
This newly found form of air bubble -- which the scientists have named the separated vortex ring -- is physically detached from the bristles and is stabilised by air flowing through it.
In this work, ten modes of divergence-free vortex ring structures are superimposed onto the shear layers of the jet near the inflow boundary in every iteration.
I scanned the instruments to confirm I wasn't exceeding the parameters in which a helicopter can fall through its own down-wash, known as vortex ring state--I wasn't--so what was happening?
Each vortex ring consists of four segments of a vortex line, and the leading segment is placed on the 1/4 chord line.
All of the species I investigated produced vortex rings. In the more efficient swimmers, all of the water in their wakes ended up in vortex rings, but in the fast-but-less-efficient swimmers, much of the water in their wakes ended up in a straight stream, or trailing jet, behind a smaller vortex ring.
Other experiments on the first show include fellow presenter Jem Stansfield trying to knock down a house of bricks using a supersonically generated vortex ring.
The absolute permanence of the rotation and the unchangeable relation you have proved between it and the portion of the fluid once acquiring such motion, in a perfect fluid, shows that if there is a perfect fluid all through space, constituting the substance of all matter, a vortex ring would be as permanent as the solid hard atoms assumed by Lucretius and his followers.
The Air Accident Investigations Board found the crash happened after Mr Law descended too quickly causing a vortex ring, so the copter was not supported by air.