Quantitative dimensionless measure of the friction forces between fluid pipe flow and inner pipe walls based on the Darcy–Weisbach equation.
It depends on Reynolds number \rm Re and roughness \epsilon (see Fig. 1).
Fig. 1. Schematic chart showing how Darcy friction factor depends on Reynolds number \rm Re and roughness \epsilon (following Moody Chart) |
In engineering practice one can use either Moody Chart or Darcy friction factor @model to estimate the actual value of Darcy friction factor .
See also
Physics / Fluid Dynamics / Pipe Flow Dynamics / Darcy–Weisbach equation
[ Darcy friction factor @model ] [ Moody Chart ]
Reference
[1] https://gmallya.com/moodys-friction-factor-calculator/