A circular duct, with inner diameter of 6.35 mm and heated length of 122 cm, is subjected to a constant wall heat flux over a part of its length. A Newtonian a. Assume that at entrance to the heated...

A circular duct, with inner diameter of 6.35 mm and heated length of 122 cm, is subjected to a constant wall heat flux over a part of its length. A Newtonian

a. Assume that at entrance to the heated section, the fluid velocity and temperature profiles are both flat (i.e., temperature and velocity are uniformly distributed). Determine the wall surface temperature at the exit of the heated section.

b. Now assume that at entrance to the heated section the flow is hydrodynamically fully developed, but has a uniform temperature. Calculate the wall surface temperature at 1.0 cm downstream from the entrance to the heated section