# Wall shear stress

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 Revision as of 18:16, 23 November 2011 (view source)Peter (Talk | contribs)m (Reverted edits by Zonder (talk) to last revision by Peter)← Older edit Latest revision as of 10:21, 5 December 2012 (view source)Zonder (Talk | contribs) (Unit) Line 3: Line 3: :$\tau_w = \mu \left(\frac{\partial u}{\partial y} \right)_{y=0}$ :$\tau_w = \mu \left(\frac{\partial u}{\partial y} \right)_{y=0}$ - Where $\mu$ is the [[Dynamic viscosity|dynamic viscosity]], $u$ is the flow velocity parallell to the wall and $y$ is the distance to the wall. + Where $\mu$ is the [[Dynamic viscosity|dynamic viscosity]], $u$ is the flow velocity parallel to the wall and $y$ is the distance to the wall. + + The SI unit of wall shear stress is pascal ($Pa$), which is identical to  $\frac{kg}{m\cdot s^2}$.

## Latest revision as of 10:21, 5 December 2012

The wall shear stress, $\tau_w$, is given by:

$\tau_w = \mu \left(\frac{\partial u}{\partial y} \right)_{y=0}$

Where $\mu$ is the dynamic viscosity, $u$ is the flow velocity parallel to the wall and $y$ is the distance to the wall.

The SI unit of wall shear stress is pascal ($Pa$), which is identical to $\frac{kg}{m\cdot s^2}$.