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In turbulent flow, a rough pipe has the same friction factor as a smooth pipe | |
A. | in the zone of complete turbulence. [Wrong Answer] |
B. | when the roughness projections are much smaller than the thickness of the laminar film. [Correct Answer] |
C. | everywhere in the transition zone. [Wrong Answer] |
D. | when the friction factor is independent of the Reynold's number. [Wrong Answer] |