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Water flows through a circular tube with a velocity of 2 m/s. The diameter of the pipe is 14 cm. Take kinematic viscosity of water 10^-6 m^2/s and density of water 1000 kg/m^3.

(a) 2.8*10^8

(b) 2.8*10^5

(c) 2800

(d) 28000

The question was posed to me during an internship interview.

I would like to ask this question from Flow of Viscous Fluid Through Circular Pipes topic in chapter Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

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Right answer is (b) 2.8*10^5

The explanation: Reynolds number is given by VD/ν = (2*0.14)/10^-6. Density given is extra information. One shouldn’t be confused by that.

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