A nozzle is a device that is used to increase the velocity of a fluid by varying the cross-sectional area. At the last section of a jet engine (Fig Q1.a, section 5), air with a mass flow rate of 50...

 A nozzle is a device that is used to increase the velocity of a fluid by varying the cross-sectional area. At the last section of a jet engine (Fig Q1.a, section 5), air with a mass flow rate of 50 kg/s at a pressure of 500 kPa and a temperature of 600 K enters a nozzle with an inlet cross-sectional area of 5 m2. The exit area of the nozzle is 20% of its inlet area. The air leaves the nozzle at a velocity of 300 m/s. The nozzle is not well-insulated and during this process, 5 kJ/kg heat is lost.
Figure Q1.a: Schematic of a Jet engine.

(i) In analysing this nozzle using the 1st law of thermodynamics, the change in which type of energy is negligible?

Extracted text: velocity of 300 m/s. The nozzle is not well-insulated and during this process, 5 kJ/kg heat is lost. Air No. Name 1 Diffuser 2 Compressor Combustion chamber 4 Turbine Nozzle 4 Figure Q1.a: Schematic of a Jet engine.