3.2.29 cw_evangelides - Evangelides-Papaevangelou-Tzimopoulos friction factor

f = cw_evangelides(d,e,re)

Calculate the Evangelides-Papaevangelou-Tzimopoulos 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

Evangelides diameter is <= 0

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