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For laminar flow in a pipe of circular cross-section, the Darcy's friction factor f is | |
A. | directly proportional to Reynolds number and independent of pipe wall roughness [Wrong Answer] |
B. | directly proportional to pipe wall roughness and independent of Reynolds number [Wrong Answer] |
C. | inversely proportional to Reynolds number and indpendent of pipe wall roughness [Correct Answer] |
D. | inversely proportional to Reynolds number and directly proportional to pipe wall roughness [Wrong Answer] |