2. HW. Air at 2 bar and 204.4 C is heated as it flows through a tube with a diameter of 25 mm at a velocity of 10 m/s. Calculate the heat transfer per unit length of tube if a constant heat flux condition is maintained at the wall and the wall temperature is 27.8 C above the air temperature, all along the length of the tube. How much would the bulk temperature increase over a 3 m length of the tube