. Shell Momentum Balance for Flow Between Parallel Plates. A fluid of constant density is flowing in laminar flow at steady state in the horizontal x direction between two flat and parallel plates. The distance between the two plates in the vertical y direction is 2y0. Using a shell momentum balance, derive the equation for the velocity profile within this fluid and the maximum velocity for a distance L m in the x direction. One boundary condition used is d%u03BDx/dy = 0 at y = 0.]