The shear stress τ0 for steady, fully developed flow inside a uniform horizontal pipe with coefficient of friction f, density ρ and velocity v, is given by
1
\(\frac{{f\rho {v^2}}}{2}\)
2
\(\frac{{f{\rho ^2}v}}{2}\)
3
\(\frac{{{\rho ^2}v}}{{2f}}\)
4
\(\frac{{\rho {v^2}}}{{2f}}\)