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A streamline is a line that is everywhere

  • A.Perpendicular to the local velocity vector
  • B.At constant pressure through the flow field
  • C.At constant temperature through the flow field
  • D.Tangent to the local velocity vector

Answer: D

By definition no fluid crosses a streamline, so in steady flow a streamline is also the path a fluid element follows. In unsteady flow streamlines, pathlines and streaklines differ, and the three coincide only when the flow is steady.

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