Engineering Board Exam Reviewer · Fluid Mechanics · easy

For laminar flow in a circular pipe, the Darcy friction factor is:

1. f = 0.316/Re0.25
2. f = 64/Re
3. f = 16/Re
4. f = 0.02 regardless of Re

Answer

B. f = 64/Re

Solution

From the Hagen–Poiseuille solution. (The Fanning factor is 16/Re.)

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