Fanning friction factor

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The fanning friction factor is a dimensionless number used in fluid flow calculations.

Defined as a friction head:

h_f = \frac{ fv^2L}{2gR}

where:

  • hf is the friction loss (in head) of the pipe
  • f is the fanning friction factor of the pipe
  • v is the fluid velocity in the pipe
  • L is the length of pipe
  • g is the acceleration due to gravity
  • R is the hydraulic radius of the pipe

This friction factor is one-fourth of the Darcy friction factor, so attention must be paid to note which one of these is meant in the "friction factor" chart or equation consulted. Of the two, this is the more commonly used by Chemical Engineers and those following the British convention.

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