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Romeo's formula

Values for calculation

$ N_{Re} $
$ ε $ $ \mathrm{m} $
$ D $ $ \mathrm{m} $
$ L $ $ \mathrm{m} $

Calculation

Friction factor

$$f=\left\{-2\cdot\log_{10}{\left[\cfrac{ε}{3.7065\cdot D}-\cfrac{5.0272}{N_{Re}}\cdot\log_{10}{\left(\cfrac{ε}{3.827\cdot D}-\cfrac{4.567}{N_{Re}}\cdot\log_{10}{\left[\left(\cfrac{ε}{7.7918\cdot D}\right)^{0.9924}+\left(\cfrac{5.3326}{208.815+N_{Re}}\right)^{0.9345}\right]}\right)}\right]}\right\}^{-2}$$

Loss coefficient

$$ζ=f\cdot\cfrac{L}{D}$$