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What types of visualization is used to delay the separation of the flow?

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in Aerodynamics by (773k points)
What types of visualization is used to delay the separation of the flow?

(a) PVT

(b) Surface oil film technique

(c) Smoke flow visualization

(d) Shadow projecting

I had been asked this question during an interview.

My question is from Lifting Flow over Cylinder topic in portion Inviscid & Incompressible Flow of Aerodynamics

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Correct choice is (c) Smoke flow visualization

For explanation: Smoke flow visualization has been used by bakic and peric to visualize the delayed separation of the flow over a smooth sphere. The flow separation occurs when the boundary layer travels far enough against an adverse pressure gradient.

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