Abstract
Flow visualization is used to study the flow that results when a potential vortex rotates normal to a stationary horizontal disc. Viscosity is seen to remove the singularity on the vortex axis and lead to the development of a three-dimensional boundary layer. The flow remains laminar below a Reynolds number,
Re
, of about 10
4
, where
Re
is based on radius and velocity at the disc edge. With further increases in
Re
the boundary layer becomes turbulent but relaminarizes as it is advected radially inwards by the highly favourable radial pressure gradient associated with the outer flow. The radius of the zone of relaminarized fluid decreases with increasing
Re
. Close to the axis the flow effuses vertically to form the core of the vortex which, for
Re
< 10
4
, is observed to undergo a massive disruption, either of the axisymmetric or helical form. The sense of the helix was observed on some occasions to be with that of the outer flow and on others to be opposite that of the outer flow.
Cited by
19 articles.
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