Family of curves that are instantaneously tangent to the velocity vector of the flow, showing direction in which a massless fluid element is travelling at any point in time
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| Fig. 1. Streamlines (solid blue lines) and corresponding velocity vector (red arrows) | Fig. 2. Streamlines (dash grey), pathline (solid red) and streakline (solid blue) |
See also
[ Streaklines ] [ Pathlines ]