For turbulent pipe flow (Re > 4000), the Darcy friction factor f for smooth pipes is best described by the:
Choose the correct answer
Hagen-Poiseuille equation (f = 64/Re)
Blasius formula f = 0.316/Re^(1/4) for smooth pipes in range 4000-100000
Manning equation
Chezy formula
Correct Answer
B. Blasius formula f = 0.316/Re^(1/4) for smooth pipes in range 4000-100000
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Blasius (1913): f = 0.316/Re^0.25 for turbulent smooth pipe flow (Re = 4000 to 10^5). For Re > 10^5: Nikuradse formula. Hagen-Poiseuille f = 64/Re applies only for laminar flow (Re < 2000).
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