Consider laminar flow of an incompressible fluid through a cylindrical tube of diameter D and length L with a fixed (modified) pressure drop (P0PL). Derive an expression for the dissipation function v=:v, and (by integration) determine the total rate of conversion of kinetic energy to internal energy. Write your answer in the form Ev=21mvz2ev where m is the mass flow rate. Clearly express ev as a function of the system parameters