For laminar flow in a pipe of circular cross-section, the Darcy’s friction fac

Question

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

Options:

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

Answer: Option C

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