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How the finite lift is measured in the cylinder?

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How the finite lift is measured in the cylinder?

(a) Moving up and down

(b) Moving up

(c) Moving left and right

(d) Spinning cylinder

I got this question in homework.

The query is from Lifting Flow over Cylinder in chapter Inviscid & Incompressible Flow of Aerodynamics

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Right answer is (d) Spinning cylinder

Easy explanation: A finite lift is measured for the spinning cylinder in the wind tunnel.T he friction between the fluid and the surface of the cylinder tends to drag the fluid near the surface in the same direction as the rotational motion.

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