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Vortex Rings (Paperback, 2009 ed.)
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Vortex Rings (Paperback, 2009 ed.)
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Vortex flow is one of the fundamental types of fluid and gas
motion. These flows are the most spectacular in the form of
concentrated vortices, characterized by the localization of
vorticity (curl of velocity) in bounded regions of a space, beyond
which the vorticity is either absent or rapidly falls down to zero.
Concentrated vortices are often observed in nature, exemplified by
atmospheric cyclones, whirlwinds and tornados, oceanic vortices,
whirlpools on a water s- face, and ring vortices caused by
explosive outburst of volcanoes. In technical - vices concentrated
vortices form when flow separates from sharp edges of flying
vehicles and ships. Among these are vortices flowing off the ends
of airplane wings, and intentionally generated vortices for
intensification of burning in c- bustion chambers, vortices in
cyclonic devices used for mixing or separation of impurities in
fluids and gases. One such remarkable and frequent type of conc-
trated vortices is a vortex ring which constitutes a vortex tube
closed into a t- oidal ring moving in a surrounding fluid like an
isolated body out of contact with solid boundaries of the flow
region if such boundaries exist. Formation and motion of vortex
rings are important part of the dynamics of a continuum medium and
have been studied for more than a century.
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