Prob. 12 Conservation of momentum equation for a steady and fully developed laminar flow of a viscous fluid in a circular pipe in cylindrical coordinates is d du 1 dp p dx + [ + (-)] = r r dr dr The flow is extremely viscous, so that the energy equation reduces to 1 d 0=k-. r dr dr - (47) + u where is the viscous dissipation term. Determine the temperature distribution inside the pipe, subject to constant wall temperature (T= T at r=ro). 0 $ = (du/dr)