The Reynolds number Re is taken to be Re = V D / ν, where V is the mean velocity of fluid flow, D is the pipe diameter, and where ν is the kinematic viscosity μ / ρ, with μ the fluid's Dynamic viscosity, and ρ the fluid's density.In this article, the following conventions and definitions are to be understood: 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. 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. ![]() ![]() Equations for calculations of the Darcy friction factor
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