An incompressible fluid flows steadily in the entrance region of a circular tube of radius R = 75 mm. The flow rate is Q = 0:1 m3=s. Find the uniform velocity U1 at the entrance. The velocity distribution at a section downstream is u umax = 1− r R 2 Evaluate the maximum velocity at the downstream section. Calculate the pressure drop that would exist in the channel if viscous friction at the walls could be neglected.