3.2.2 cw_haaland - Haaland friction factor

f = cw_haaland(d,e,re)

Calculate the Haaland approximation of the Colebrook-White equation.

Arguments

d

Pipe internal diameter ().

e

Pipe effective roughness .

re

Reynolds number

Returns Darcy friction factor , dimensionless.

Possible Errors

Haaland diameter is <= 0

The given internal diameter of the pipe must be above zero.