# Friction velocity

(Difference between revisions)
 Revision as of 15:32, 19 December 2008 (view source)m (sitacel)← Older edit Latest revision as of 18:04, 19 December 2008 (view source)Peter (Talk | contribs) m (Reverted edits by AceldRonla (Talk) to last version by Jola) 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:

## Latest revision as of 18:04, 19 December 2008

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.