Q.

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

A. 16/re
B. 64/re
C. re/16
D. re/64
Answer» B. 64/re
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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