helical_gnielinski - Gnielinski helical friction factor

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3.3.5 helical_gnielinski - Gnielinski helical friction factor

f = helical_gnielinski(re,de,d,r)

Computes the Gnielinski friction factor for helical pipes for turbulent flow.

Arguments

re: Reynolds number $Re$ .
de: Dean number $De$ .
d: Pipe inner diameter ( $m$ ).
r: Helix radius $R$ .

Returns Helical friction factor (Darcy definition) $fH$ , dimensionless.

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