Consider fully developed laminar flow in the annulus between two concentric pipes. The outer pipe is stationary, and the inner pipe moves in the x direction with speed V. Assume the axial pressure gradient is zero ð∂p=∂x=0Þ. Obtain a general expression for the shear stress, τ, as a function of the radius, r, in terms of a constant, C1. Obtain a general expression for the velocity profile, uðrÞ, in terms of two constants, C1 and C2. Obtain expressions for C1 and C2.