Air enters an adiabatic nozzle steadily at 500 kpa, 100°c and 30 m/s and leaves at 100 kpa and 240 m/s. the inlet area of the nozzle is 50 cm2 . determine (a) the mass flow rate through the nozzle, (b) the exit temperature of the air, and (c) the exit area of the nozzle. to save time use constant specific heats evaluated at 300 °k.

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?