In the complete turbulence zone (in rough pipes), the____________________?
Correct answer: A. Friction factor is independent of the relative roughness
- A. Friction factor is independent of the relative roughness
- B. Laminar film covers the roughness projections
- C. Friction factor depends upon NRe only
- D. Rough and smooth pipes have the same friction factor
Explanation
In the complete turbulence zone, viscous effects are negligible and the friction factor no longer changes appreciably with Reynolds number. It is governed mainly by the relative roughness, so rough and smooth pipes do not have the same friction factor.
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