Question

The strength of the vortex flow can be given by ______________

(a) Γ=2*pi*C

(b) Γ=2*pi

(c) Γ=-2*pi*C

(d) Γ=0

This question was addressed to me in exam.

My question comes from Vortex Flow topic in section Inviscid & Incompressible Flow of Aerodynamics

Answer 1

Right choice is (c) Γ=-2*pi*C

The explanation: The circulation for vortex flow can be given by –

Γ=2*pi*C where, C – constant and Γ is the strength of the vortex flow.

When Γ is positive, it means that vortex of positive strength rotates in the clockwise direction and vice versa.