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Question 30944
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Fluid Mechanics: Reynold's Number MCQ

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Reynold's NumberMediumQuestion 30944

Question

Reynold's number Re = ρvD/η. Flow is turbulent when Re is:
  1. A
    < 1000
  2. B
    1000–2000
  3. C
    > 4000
    Correct
  4. D
    Exactly 2000

Correct answer

> 4000

Explanation

Re < 2000: laminar. 2000–4000: transition. Re > 4000: fully turbulent flow.

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