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Relative roughness is_________

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+1 vote
in Fluid Mechanics by (118k points)
Relative roughness is_________

(a) ϵ/D

(b) ϵ*D

(c) ϵ/Dm

(d) ϵgD

I had been asked this question in an interview.

Question is from Loss of Head due to Friction in Viscous Flow topic in portion Viscous Flow & Turbulent Flow of Fluid Mechanics

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Best answer
The correct choice is (a) ϵ/D

Easiest explanation: Relative roughness is defined as the quantity used to measure the roughness of the pipe’s surface. It is equal to the average height of the surface irregularities divided by the pipe diameter. Therefore, Relative roughness= ϵ/D.

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