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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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