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For non-smooth pipelines
the
Darcy friction factor can be estimated from
empirical Colebrook–White implicit Colebrook–White correlation which works for non-
laminar flow:
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\frac{1}{\sqrt{f}} = -2 \, \log \Bigg( \frac{\epsilon}{3.7 \, d} + \frac{2.51}{{\rm Re} \sqrt{f}} \Bigg) |
There are numerous approximation of
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explicit approximations of Colebrook–White correlation, particularly (Monzon, Romeo, Royo, 2002):
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f = 0.25 \, \biggleft[ \log \biggleft( \frac{\epsilon / d}{3.7065} - \frac{5.0272}{\rm Re} \log \Lambda \biggright) \biggright]^{-2} |
где
– безразмерный параметр, рассчитываемый по формуле:
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