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Coefficients of Friction

The friction ...

Question

The friction factor of laminar required flow in a circular pipe is proportional to

A

Reynold's number

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B

Inverse to the Reynold's number

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C

Square of Reynold's number

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D

Square root of the Reynold's number

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Solution

The correct option is B Inverse to the Reynold's number
Friction factor for laminar flow through pipe is
$f = \frac{64}{R e}$
$f \propto \frac{1}{R e}$

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