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See Surface roughness for more data on typical values for various materials and processing conditions.
The most popular universal model of Darcy friction factor is:
| LaTeX Math Block | ||||
|---|---|---|---|---|
| ||||
\begin{cases}
f = 64/\mbox{Re}, & \mbox{if Re}<2,100
\\f = 64/\mbox{Re}, & 2,100 < \mbox{if Re}<4,100
\\f = f_{CW}(), & \mbox{if Re}>2,100
\end{cases} |
See also
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Physics / Fluid Dynamics / Pipe Flow Dynamics / Darcy–Weisbach equation / Darcy friction factor
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