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Which of the following are the imaginary lines?

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in Aerodynamics by (773k points)
Which of the following are the imaginary lines?

(a) Streamline and pathline

(b) Pathline and streakline

(c) Streamline and streakline

(d) Only streamline

I have been asked this question in final exam.

Asked question is from Pathlines, Streamlines, Streaklines in portion Aerodynamics – Fundamental Principles and Equations of Aerodynamics

1 Answer

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Correct option is (a) Streamline and pathline

Easiest explanation: Both Streamlines and pathline are imaginary because streamline represents the direction of the fluid flow from a particular point in the fluid flow domain. This point can be anywhere in the fluid domain and is imaginary. Pathline is the path traced by a fluid element at a given interval of the time.

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