Civil Engineering MCQAE Level Civil Engineering
In a free vortex (irrotational vortex), the velocity distribution with radius r is:
Fluid MechanicsFree VortexMEDIUM
Choose the correct answer
A
V proportional to r
B
V proportional to 1/r (V x r = constant)
C
V = constant
D
V proportional to r^2
Correct Answer
B. V proportional to 1/r (V x r = constant)
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Free (irrotational) vortex: V x r = constant (circulation Gamma = 2pi x V x r = const). In a forced (rotational) vortex: V = omega x r (solid body rotation). Free vortex has no external energy input.
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