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What does the below figure show?

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in Aerodynamics by (773k points)
What does the below figure show?

(a) streamlines

(b) streaklines

(c) pathlines

(d) stream-tubes

The question was asked by my school principal while I was bunking the class.

This question is from Uniform Flow topic in division Inviscid & Incompressible Flow of Aerodynamics

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Correct answer is (d) stream-tubes

Easiest explanation: A group of streamlines forming a passage through which the flow passes is called as stream-tubes. They are bounded by a number of streamlines. The fluid may enter or leave the surface through the ends of the stream-tubes.

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