For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?

Fluid Mechanics 30/01/2021

A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness

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