# Friction velocity

(Difference between revisions)
 Revision as of 13:20, 13 May 2006 (view source)Jola (Talk | contribs)← Older edit Revision as of 15:32, 19 December 2008 (view source)m (sitacel)Newer edit → Line 1: Line 1: + trocere Dimensional analysis shows that at a wall a charateristic velocity, called the ''friction velocity'', $u_*$, can be defined in the following way: Dimensional analysis shows that at a wall a charateristic velocity, called the ''friction velocity'', $u_*$, can be defined in the following way:

## Revision as of 15:32, 19 December 2008

trocere Dimensional analysis shows that at a wall a charateristic velocity, called the friction velocity, $u_*$, can be defined in the following way:

$u_* \equiv \sqrt{\frac{\tau_w}{\rho}}$

Where $\tau_w$ is the wall shear stress and $\rho$ is the fluid density at the wall.