+1 vote
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What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10^-6) to be laminar in nature? Assume Lower critical Reynolds number to be 2100.

(a) 2.1 mm

(b) 21 mm

(c) 21 cm

(d) 0.21 mm

The question was asked by my school principal while I was bunking the class.

My question is from Flow of Viscous Fluid Through Circular Pipes topic in division Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

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Best answer
The correct choice is (a) 2.1 mm

The best I can explain: If the Reynolds number of the flow is below its lower critical Reynolds number, the flow is clearly laminar. The maximum diameter can be found for Re = 2100. The diameter comes out to be 2.1 mm.

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