'Life of the ancient Egyptians' -- subject(s): Social life and
customs, Civilization
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The cast of Pravidla kruhu - 1987 includes: Krec as Ballet group
Dita Moers Strouhal as Kukadlo Stanislav Zindulka as Kaska
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A descriptive experimental study was made in both air and water
of the temporally periodic motion that occurs in the vortex whistle
and cyclone separator. The motion can be described in terms of an
oscillator that derives its energy from hydrodynamic instability of
the steady swirling flow and whose frequency is determined by an
angular velocity characteristic of this steady flow. The relevant
dynamical parameters are the Rossby number and Reynolds number for
the steady flow with the addition of the Strouhal number for the
time-dependent flow. The results of this study were compared with
the vortex breakdown phenomenon over swept-back wings. Breakdown
can be described in the same terms as for the other two cases and
it appears that all three motions are basically the same.