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Laminar flow in a circular pipe: friction factor dependence on Reynolds number For viscous (laminar) flow in a pipe of uniform diameter, the Darcy friction factor varies as which function of the Reynolds number R<sub>N</sub>? Choose the correct expression.

Q: Laminar flow in a circular pipe: friction factor dependence on Reynolds number For viscous (laminar) flow in a pipe of uniform diameter, the Darcy friction factor varies as which function of the Reynolds number R N ? Choose the correct exp…

Concept/Approach For fully developed, laminar flow in a circular pipe, the Darcy friction factor is f = 64/Re. The head loss due to friction is then hf = f (L/D) (V²/(2g)). Final Answer 64/RN

Difficulty: Easy

1/RN
4/RN
16/RN
64/RN

Correct Answer: 64/RN

Explanation:

Concept/Approach
For fully developed, laminar flow in a circular pipe, the Darcy friction factor is f = 64/Re. The head loss due to friction is then h_f = f (L/D) (V²/(2g)).

Final Answer
64/RN

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