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Darcy friction factor
depends on
flow regime, as well as shape Reynolds number and a shape and
roughness of inner pipe walls
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f = f({\rm Re}, \epsilon) |
For a smooth (
) tubular pipeline
Darcy friction factor can be estimated from various
empirical correlations :
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\begin{cases}
f = 64/\mbox{Re}, & \forall & \mbox{if Re}<2,100
\\f = 0.03048 + k \cdot ( \mbox{Re} -2,100), & \forall & 2,100 < \mbox{if Re}<4,000
\\f = f_{CW}( \mbox{Re}, \, \epsilon), & \forall & \mbox{if Re}>4,000
\end{cases} |
where
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