Question

In the figure shown below, what does the fluid particle ‘A’ represents from t=0 to t=t?

(a) Streamline

(b) Streakline

(c) Pathline

(d) Velocity vector

I had been asked this question in an international level competition.

Question is from Pathlines, Streamlines, Streaklines topic in section Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Right answer is (c) Pathline

For explanation I would say: Pathline is defined as the path traced by a particular fluid particle in some given time interval. The fluid particle ‘A’ at t=0 travels till t=t.