For laminar flow in a pipe of circular cross-section, the Darcy’s fr – McqOptions

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1.	For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is
A.	irectly proportional to Reynolds number and independent of pipe wall roughness
B.	irectly proportional to pipe wall roughness and independent of Reynolds number
C.	nversely proportional to Reynolds number and indpendent of pipe wall roughness
D.	nversely proportional to Reynolds number and directly proportional to pipe wall roughness
Answer» D. nversely proportional to Reynolds number and directly proportional to pipe wall roughness

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