The velocity distribution for laminar flow between parallel plates is given by u umax = 1− 2y h 2 where h is the distance separating the plates and the origin is placed midway between the plates. consider a flow of water at 15 c, with umax = 0: 10 m=s and h= 0: 1 mm. calculate the shear stress on the upper plate and give its direction. sketch the variation of shear stress across the channel.