Question

Fanning friction factor is _________

(a) 0.25 times Darcy friction factor

(b) Same as Darcy friction factor

(c) 2 times Darcy friction factor

(d) Independent

I got this question during an interview for a job.

I'm obligated to ask this question of Dimensionless Numbers topic in portion Dimensional and Model Analysis of Fluid Mechanics

Answer 1

Correct choice is (a) 0.25 times Darcy friction factor

For explanation I would say: Fanning friction factor is 0.25 times Darcy friction factor. Fanning friction factor in fluid mechanics deals fraction of pressure losses due to friction in the pipe.