The GATE Grind

GATE 2025 CH – Question 19

Fluid Mechanics and Mechanical Operations · Fluid properties, fluid statics and fluid kinematics · 1 mark · Multiple choice

Choose the CORRECT option for pathlines, streaklines and streamlines for a STEADY flow field.

  1. All three lines are identical
  2. Only pathlines and streaklines are identical
  3. Only pathlines and streamlines are identical
  4. Only streamlines and streaklines are identical

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Show answer and explanation

Correct answer: (A) All three lines are identical

Explanation

In a steady flow the velocity at each point does not change with time. A fluid particle then follows the same path as every other particle that passes through that point, and the velocity is always tangent to that path. So the path of a particle, the line of particles released from one point and the streamline all coincide.