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Wood's approximate formula

Values for calculation

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

Calculation

Friction factor

$$f=0.094\cdot\left(\cfrac{ε}{D}\right)^{0.225}+0.53\cdot\cfrac{ε}{D}+88\cdot\left(\cfrac{ε}{D}\right)^{0.4}\cdot N_{Re}^{-1.62\cdot\left(ε/D\right)^{0.134}}$$

Loss coefficient

$$ζ=f\cdot\cfrac{L}{D}$$