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Which among the following is formula for friction factor of circular pipes?

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+1 vote
in Fluid Mechanics by (118k points)
Which among the following is formula for friction factor of circular pipes?

(a) 16/Re

(b) 64/Re

(c) Re/16

(d) Re/64

The question was asked in class test.

My question comes from Loss of Head due to Friction in Viscous Flow in division Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
The correct choice is (b) 64/Re

For explanation: Circular pipes have a diameter treated in a round manner. For a fluid flow which is laminar head loss is directly proportional to the fluid velocity. Thus, friction factor is inversely proportional to its velocity. Therefore, the correct option is ‘64/Re’.

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