Consider steady, continuous, incompressible, fully developed laminar flow of a Newtonian fluid in an infinitely long round pipe annulus of inner radius Ri and outer radius Ro (Fig. P2) inclined at an anglee. The fluid is not open to the atmosphere and flows down the pipe annulus due to an applied pressure gradient (dp/dx = -G) and from gravity. Derive an expression for the velocity field, the shear stress and the flow rate in the annular space in the pipe using the appropriate form of the Navier - Stokes equations. Outer pipe wall Fluid: p, u R; R