3.3.7 helical_mori_nakayama - Mori-Nakayama friction factor

f = helical_mori_nakayama(re, de)

Computes the Mori-Nakayama friction factor for helical pipes with a given dean number valid for the entire laminar flow region.

Arguments

re

Reynolds number .

de

Dean number .

Returns Helical friction factor (Darcy definition) , dimensionless.