Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?
Correct answer: C. Both A. & B.
- A. Not a function of the roughness of pipe wall
- B. Inversely proportional to Reynolds number
- C. Both A. & B.
- D. Neither A. nor B.
Explanation
For fully developed laminar flow in a circular pipe, the Fanning factor is f = 16/Re, so it is inversely proportional to Reynolds number. Laminar flow also has no roughness effect because the viscous sublayer covers the wall irregularities.
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