Wall shear stress

(Difference between revisions)
 Revision as of 14:49, 18 December 2008 (view source)Peter (Talk | contribs)m (Reverted edits by AcellIcotr (Talk) to last version by Jola)← Older edit Latest revision as of 10:21, 5 December 2012 (view source)Zonder (Talk | contribs) (Unit) (2 intermediate revisions not shown) 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 $\frac{kg}{m\cdot s^2}$.