Civil Engineering MCQAE Level Civil Engineering
For fully turbulent flow in a rough pipe, the Darcy friction factor f is determined by the:
Fluid MechanicsDarcy WeisbachMEDIUM
Choose the correct answer
A
Reynolds number only
B
Relative roughness e/D only
C
Both Re and e/D (Moody chart)
D
Pipe material density
Correct Answer
C. Both Re and e/D (Moody chart)
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For turbulent flow, f depends on both Re and relative roughness e/D (Moody chart, Colebrook-White equation). For fully rough turbulent flow (high Re), f depends only on e/D (rough pipe law: 1/sqrt(f) = -2 log(e/3.7D)).
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