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# Darcy Friction Factor

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Equation / Last modified by EmilyB on 2016/07/11 17:35
`f = `

Darcy Friction Factor

Variable | Instructions | Datatype |
---|---|---|

`(Re)"Reynold's number"` | Enter Reynold's number | Decimal |

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EmilyB.Darcy Friction Factor

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The **Darcy Friction Factor** is a dimensionless quanty used in the Darcy-Weisbach equation, for the description of friction losses in pipe flow as well as open-channel flow. It is four times larger than the Fanning friction factor. The Darcy Friction Factor for laminar flow in a circular flow in a circular pipe (Reynold's number less than 2320) is given by the following formula: `f=64/(Re)` where:

- `f` = Darcy Friction Factor
- `Re` = Reynold's number

## References

The formula and definition are from Wikipedia (https://en.wikipedia.org/wiki/Darcy_friction_factor_formulae).