Solve this multiple-choice question and choose the correct option.

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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_N? Choose the correct expression.

Mechanical Engineering Hydraulics and Fluid Mechanics Difficulty: Easy

Choose an option

A

1/RN
B

4/RN
C

16/RN
D

64/RN

Answer

Correct Answer: 64/RN

Explanation

Concept/ApproachFor 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 Answer64/RN

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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 RN? Choose the correct expression.

Answer

Explanation

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 expression.