2569Civil EngineeringMedium
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________?
Adirectly proportional to Reynolds number and independent of pipe wall roughness
Bdirectly proportional to pipe wall roughness and independent of Reynolds number
Cinversely proportional to Reynolds number and directly proportional to pipe wall roughness
Dinversely proportional to Reynolds number and indpendent of pipe wall roughness
Correct answer
D. inversely proportional to Reynolds number and indpendent of pipe wall roughness
Explanation
The correct answer is inversely proportional to Reynolds number and indpendent of pipe wall roughness.