Colebrook-White equation

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The Colebrook-White equation is used to iteratively solve for the Darcy-Weisbach friction factor f.

For Free Surface Flow:

$\frac{1}{\sqrt{f}} = -2 \log (\frac{e}{12R} + \frac{2.51}{Re\sqrt{f}})$

For Full Flow (Closed Conduit):

$\frac{1}{\sqrt{f}} = -2 \log (\frac{e}{14.8R} + \frac{2.51}{Re\sqrt{f}})$

Where f is a function of:

Because the iterative search for the correct f value can be quite time-consuming, the Swamee-Jain equation can be used to solve directly for f.

References

2002, Computer Applications In Hydraulic Engineering, 5th Ed., Haestad Press, pg. 16

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Colebrook-White_equation". A list of authors is available in Wikipedia.

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