Friction velocity
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:<math>u_* \equiv \sqrt{\frac{\tau_w}{\rho}}</math> | :<math>u_* \equiv \sqrt{\frac{\tau_w}{\rho}}</math> | ||
| - | Where <math>\tau_w</math> is the wall shear stress and <math>\rho</math> is the fluid density at the wall. | + | Where <math>\tau_w</math> is the [[Wall shear stress|wall shear stress]] and <math>\rho</math> is the fluid density at the wall. |
Latest revision as of 18:04, 19 December 2008
Dimensional analysis shows that at a wall a charateristic velocity, called the friction velocity, 
, can be defined in the following way:
Where 
is the wall shear stress and 
is the fluid density at the wall.
