Moody diagram (friction factor)

1. Introduction

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.

2. Diagram

Moody diagram calculation friction factor This diagram has been generated using Churchill correlation.

If one wants to calculate the Fanning friction factor, the results of this graph must be divided by 4.

Source file
- Image
- Excel sheet