Rheology and Processing of Polymers

Consider flow of a viscous Newtonian fluid in a tube of radius (R). The flow is along the axis of the tube and is caused by a pressure drop (P) over a tube length (L). Find the velocity profile in the tube and calculate (and plot as a function of P ) the flowrate. How can this be used to determine the viscosity of the fluid? Repeat the problem for a power-law fluid, in which the viscosity is =0n1. Plot the ratio of the corresponding flowrates for a given pressure drop (P/L) as a function of the power-law index (0.1<>