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The average velocity for laminar flow in a circular pipe of radius 'r' occurs at a distance of from its centre:

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UKPSC JE Civil 8 May 2022 Official Paper-II
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  1. 0.500 r
  2. 0.750 r
  3. 0.656 r
  4. 0.707 r 

Answer (Detailed Solution Below)

Option 4 : 0.707 r 
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Detailed Solution

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Concept:

Laminar flow through circular pipe:

Velocity equation;

Average or mean velocity () = 

2(r2 - y2) = r2

r2 = 2y2, y = 

y = 0.707r (from centre of pipe)

Hence option (4) is the correct answer.

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