Page History

...

Consider fluid flowing through a circular pipe of constant cross-section. The pipe diameter D = 0.2 m and length L = 8 m. The inlet velocity Ū_z = 1 m/s. Consider the velocity to be constant over the inlet cross-section. The fluid exhausts into the ambient atmosphere which is at a pressure of 1 atm. Take density ρ = 1 kg/ m³ and coefficient of viscosity µ = 2 x 10^-3 kg/(ms). The Reynolds number Re based on the pipe diameter is

{latex}
\large
$$
{Re} = {\rho {\bar{U}}_zD \over \mu} = 100
$$
{latex}

where Ū_z is the average velocity at the inlet, which is 1 m/s in this case.

...