Moody diagram (friction factor)
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| Section summary |
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| 1. How to find the friction factor graphically ? The Moody diagram |
| 2. Moody Diagram |
1. How to find the friction factor graphically ? The 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.
2. Moody Diagram
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.If one wants to calculate the Fanning friction factor, the results of this graph must be divided by 4.
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