Darcy friction factor - Serghides's solution (Variable B)


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.

Serghides’s solution is used to solve directly for the Darcy–Weisbach friction factor f for a full-flowing circular pipe. It is an approximation of the implicit Colebrook–White equation. It was derived using Steffensen’s method.

The shown formula calculates the variable B in Serghides’s solution. The variable A in the formula is another variable in Serghides’s solution and can be calculated using the formula:

See also

Variable (A) formula

Related formulas


BVariable in Serghides's solution (dimensionless)
ϵPipe's effective roughness height (m)
DPipe's inside diameter (m)
AVariable in Serghides's solution (dimensionless)
ReReynolds number (dimensionless)