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The friction factor is used to calculate the pressure drop due to
the flow of a fluid in a pipe. It represents the interaction in
between the fluid and the pipe. There are different ways to
calculate it, one can be graphical, using a Moody graph.
Note that the friction factor used here is
Darcy (also called Darcy-Wesibach or Moody) friction factor.
The Moody diagram helps to answer very quickly to the following question : what is the friction factor in pipes ?
You can download this Moody Diagram for free.This diagram has been generated using Churchill correlation.