Colebrook equation

Reference data et engineering information about colebrook equation pour fluid mechanics applications.

colebrookequationCalculatrice

Overview

The Colebrook equation is the standard method for calculating the Darcy friction factor in turbulent pipe flow. It accounts for both the Reynolds number and pipe surface roughness.

Variables

Symbol	Description	Unit
$f$	Darcy friction factor	—
$\varepsilon$	Pipe roughness	m
$D$	Pipe diameter	m
$Re$	Reynolds number	—

Formula

$\frac{1}{\sqrt{f}} = -2 \log_{10}\left(\frac{\varepsilon/D}{3.7} + \frac{2.51}{Re \sqrt{f}}\right)$

Calculator

Colebrook Equation Calculator

Reynolds Number

Relative Roughness (ε/D)

Notes

Results are approximate and should be verified for critical applications
Input values should be within reasonable engineering ranges

References

Original Source

Source: engineeringtoolbox.com