Darcy friction factor - Brkić solution


In fluid dynamics, the Darcy friction factor formulae are equations that allow the calculation of the Darcy friction factor, a dimensionless quantity used in the Darcy–Weisbach equation, for the description of friction losses in pipe flow as well as open-channel flow.

The Darcy friction factor is also known as the Darcy–Weisbach friction factor, resistance coefficient or simply friction factor; by definition it is four times larger than the Fanning friction factor.

Brkić shows one approximation of the Colebrook equation based on the Lambert W-function. The equation was found to match the Colebrook–White equation within 3.15%.

See Also:

Darcy friction factor – Brkić solution – Variable S

Related formulas


fDarcy friction factor (dimensionless)
ϵPipe's effective roughness height (m)
DPipe's inside diameter (m)
SVariable in Brkić solution (dimensionless)
ReReynolds number (dimensionless)