Discussion
The locus of temporary locations of all particles that have passed through a fixed point in the flow field at a particular instant is known as
Answer: B
The locus is a streakline.
A streakline joins, at one instant, all the particles that have passed through a given fixed point, such as the line of dye or smoke released continuously from a nozzle.
A streamline is everywhere tangent to the velocity field at an instant. A pathline is the trajectory of a single particle over time. A timeline is a line of particles that were marked at the same instant. In steady flow streamlines, pathlines and streaklines coincide, but in unsteady flow only the streakline matches this definition.
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