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Haaland equation

The Haaland equation is an approximate explicit equation which combines experimental results of studies of laminar and turbulent flow in pipes. It was developed by S. E. Haaland in 1983.

The Haaland equation is defined as:

\frac{1}{\sqrt {f}} = -1.8 \log \left[ \left( \frac{\varepsilon/D}{3.7} \right)^{1.11} + \frac{6.9}{\mathrm{Re}} \right]



  • Haaland, SE (1983). "Simple and Explicit Formulas for the Friction Factor in Turbulent Flow". Trans. ASIVIE, J. of Fluids Engineering 103: 89-90.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Haaland_equation". A list of authors is available in Wikipedia.
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