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@wikipediaDarcy friction factor 

LaTeX Math Inline
bodyf
 depends on Reynolds number and a shape and roughness 
LaTeX Math Inline
body\epsilon
of inner pipe walls


In multiphase flow the Darcy friction factor can be calculated as Darcy friction factor Single-phase @model with specific approximation of Reynolds number:

LaTeX Math Block
alignmentleft
f = f({\rm Re}, = \epsilon)frac{InF}{ViscF}


See also

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Physics / Fluid Dynamics / Pipe Flow Dynamics / Darcy–Weisbach equation / Darcy friction factor 

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