Skin Friction Coefficient

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Skin friction coefficient, abbreviated as \(C_f\), a dimensionless number, is the ratio of shear stress and dynamic pressure of a free stream.


Skin Friction Coefficient formulas

\(\large{ C_f= \frac{\tau}{ \frac{1}{2} \; \rho \; v^2 }  }\)   
\(\large{ C_f =  \frac{\tau}{q}  }\)  


\(\large{ C_f }\)  = skin friction coefficient

\(\large{ \rho }\)  = density of fluid

\(\large{ q }\)  = dynamic pressure

\(\large{ \tau }\) (Greek symbol tau) = shear stress of fluid

\(\large{ v }\)  = velocity of fluid


Tags: Equations for Coefficient