3.2.15 cw_churchill2 - Churchill (1977) friction factor

f = cw_churchill2(d,e,re)

Calculate the Churchill 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

Churchill-2 diameter is <= 0

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