Path Lines
Definition: A path line is the trajectory of a fluid particle of fixed identity as defined by Eq. (6.1).
Fig 7.3 Path lines
A family of path lines represents the trajectories of different particles, say, P1, P 2, P3, etc. (Fig. 7.3).
Differences between Path Line and Stream Line
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Note: In a steady flow path lines are identical to streamlines as the Eulerian and Lagrangian versions become the same.
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