Water flows through a long tube of circular cross section at a mass flow rate of 0.01 kg/s. The heat flux through the wall is maintained uniformly at 3000 W/m 2 . The water enters the tube at 20 ◦C....

Water flows through a long tube of circular cross section at a mass flow rate of 0.01 kg/s. The heat flux through the wall is maintained uniformly at 3000 W/m². The water enters the tube at 20 ◦C. The inside diameter is 7.5 cm.

a. Find the required length L so that T_out
= 80 ◦C.

b. Plot the temperature of the tube as a function of length.