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Which of the following is an application of incompressible flow in a duct?

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Which of the following is an application of incompressible flow in a duct?

(a) High speed wind tunnel

(b) Low speed wind tunnel

(c) Flow in air

(d) Cannot be said

This question was posed to me during an online exam.

My doubt stems from Incompressible Flow in Duct topic in chapter Inviscid & Incompressible Flow of Aerodynamics

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The correct choice is (b) Low speed wind tunnel

The explanation is: Low speed wind tunnel is a large venturi where the airfoil is driven by a fan connected to some type of motor drive. The wind tunnel fan is similar to the propeller of an aircraft and is designed to draw the airflow through the tunnel circuit.

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