Friction velocity
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| - | Dimensional analysis shows that at a wall a charateristic velocity, called the ''friction velocity'', <math>u_*</math> can be defined in the following way: | + | Dimensional analysis shows that at a wall a charateristic velocity, called the ''friction velocity'', <math>u_*</math>, can be defined in the following way: |
:<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 and <math>\rho</math> is the fluid density at the wall. | ||
Revision as of 14:54, 11 May 2006
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.
