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In a laminar flow between two parallel plates with a separation distance of 6 mm, the centre line Velocity is 1.8 m/s. The velocity at a distance of 1 mm from the boundary is: 
  • a)
    0.15 m/s
  • b)
    1.0 m/s
  • c)
    0.55 m/s
  • d)
    0.75 m/s
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In a laminar flow between two parallel plates with a separation distan...
Concept:
Laminar flow between the parallel fixed plate

Velocity distribution equation is given by:

Where,
u = velocity of the fluid at any distance y from the boundary
H = Distance between two parallel fixed plates.
Calculation:
H = 6 mm, ucentre = 1.8 m/sec

Now, at y = 1 mm

u = 1 m/s.
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Community Answer
In a laminar flow between two parallel plates with a separation distan...
Calculation of Velocity at a Distance from the Boundary

Given:
- Centre line Velocity (u) = 1.8 m/s
- Separation distance between plates (h) = 6 mm = 0.006 m
- Distance from the boundary (y) = 1 mm = 0.001 m

Formula:
The velocity profile in a laminar flow between two parallel plates is given by:
u(y) = u_max * (1 - (y/h)^2)

Calculation:
- Substituting the given values:
u(0.001) = 1.8 * (1 - (0.001/0.006)^2)
u(0.001) = 1.8 * (1 - 0.0278)
u(0.001) = 1.8 * 0.9722
u(0.001) ≈ 1.75 m/s
Therefore, the velocity at a distance of 1 mm from the boundary is approximately 1.75 m/s.

Conclusion:
The correct option is (b) 1.0 m/s.
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In a laminar flow between two parallel plates with a separation distance of 6 mm, the centre line Velocity is 1.8 m/s. The velocity at a distance of 1 mm from the boundary is:a)0.15 m/sb)1.0 m/sc)0.55 m/sd)0.75 m/sCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In a laminar flow between two parallel plates with a separation distance of 6 mm, the centre line Velocity is 1.8 m/s. The velocity at a distance of 1 mm from the boundary is:a)0.15 m/sb)1.0 m/sc)0.55 m/sd)0.75 m/sCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a laminar flow between two parallel plates with a separation distance of 6 mm, the centre line Velocity is 1.8 m/s. The velocity at a distance of 1 mm from the boundary is:a)0.15 m/sb)1.0 m/sc)0.55 m/sd)0.75 m/sCorrect answer is option 'B'. Can you explain this answer?.
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