ABSTRACT
Velocity 0 at stagnation point where radial velocity Vr is equal and opposite to velocity of linear flow i.e. Vr=5m/s.
i.e.
Therefore
Therefore
For forced vortex V= r=100×0.15=15m/s
For source
Resultant velocity
therefore
At 0.15m radius the free vortex begins, so
therefore K=2.25
At 250mm radius
Resultant velocity
For water Turbulent flow
For air Laminar flow
Therefore
Therefore
Substituting for d
Therefore
therefore
(assuming Re in range 250-2×105)
