Quantitative dimensionless measure of the friction forces between fluid pipe flow and inner pipe walls based on Darcy–Weisbach equation.
It depends on Reynolds number and inner pipe walls roughness
(see Fig. 1):
.
|
Fig. 1. Schematic chart showing how Darcy friction factor depends on Reynolds number |
In engineering practice one can use either Moody Chart or Darcy friction factor @model to estimate the actual value of Darcy friction factor.
Darcy friction factor takes only positive values
but has singularity at zero flow velocity:
which may cause computational challenges.
Using Reduced Friction Factor instead can help in computations as it stays finite for all finite values of Reynolds number
.
Physics / Fluid Dynamics / Pipe Flow Dynamics / Darcy–Weisbach equation
[ Darcy friction factor Single-phase @model ] [ Reynolds Number for Multiphase Flow @model ]
[ Moody Chart ] [ Reduced Friction Factor (Φ) ]
