# Skin friction coefficient

(Difference between revisions)
 Revision as of 13:36, 13 May 2006 (view source)Jola (Talk | contribs)← Older edit Revision as of 17:42, 7 April 2008 (view source)Newer edit → Line 4: Line 4: Where $\tau_w$ is the local [[wall shear stress]], $\rho$ is the fluid density and $U_\infty$ is the free-stream velocity (usually taken ouside of the boundary layer or at the inlet). Where $\tau_w$ is the local [[wall shear stress]], $\rho$ is the fluid density and $U_\infty$ is the free-stream velocity (usually taken ouside of the boundary layer or at the inlet). + + + It is related to the momentum thickness as follows: $C_f \equiv 2\frac{\diff{theta}}{\diff{x}}$ + + ''Someone should add some correlations and references for them here'' ''Someone should add some correlations and references for them here'' {{stub}} {{stub}}

## Revision as of 17:42, 7 April 2008

The skin friction coefficient, $C_f$, is defined by:

$C_f \equiv \frac{\tau_w}{\frac{1}{2} \, \rho \, U_\infty^2}$

Where $\tau_w$ is the local wall shear stress, $\rho$ is the fluid density and $U_\infty$ is the free-stream velocity (usually taken ouside of the boundary layer or at the inlet).

It is related to the momentum thickness as follows: Failed to parse (unknown function\diff): C_f \equiv 2\frac{\diff{theta}}{\diff{x}}

Someone should add some correlations and references for them here