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@wikipedia


Quantitative dimensionless measure 

LaTeX Math Inline
bodyf
of the friction forces between fluid pipe flow and inner pipe walls based on Darcy–Weisbach equation.


It depends on Reynolds number 

LaTeX Math Inline
body\rm Re
and roughness 
LaTeX Math Inline
body\epsilon
  (see Fig. 1):
LaTeX Math Inline
body--uriencoded--f =f(%7B\rm Re%7D, \, \epsilon)
.


Moody Diagram Friction Factor

Fig. 1. Schematic chart showing how Darcy friction factor depends on Reynolds number 

LaTeX Math Inline
body\rm Re
 and roughness 
LaTeX Math Inline
body\epsilon
 (following [1])


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

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MoodyChart
MoodyChart
[1] https://gmallya.com/moodys-friction-factor-calculator/


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Moody's Chart.xlsx