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Section summary |
---|

1. How to find the
friction factor graphically ? The Moody diagram |

2. Moody Diagram |

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.**

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

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How to calculate the relative
roughness ? The relative roughness is calculated by dividing the pipe
roughness ε over the pipe diameter D

Pipe roughness = ε / D