Question

An insulated air nozzle with an inlet pressure of 10 bar operates with a mass flow rate of 1.2 kg s−1 . The inlet temperature is 600 K and the outlet velocity is 100 m s−1 . The inlet diameter is 0.5 m and the outlet diameter is 0.05 m. Determine the inlet velocity and the outlet temperature. What is the change in enthalpy across the nozzle? Assume air is an ideal gas. [0.95 m s−1 , 595.2 K, −5 kJ kg−1 ]

Answer 1

Given mass flow rate =1.2 kg/s

mass flow rate=density*A*V

Area=pi(douter^2-dinner^2)/4

Area=0.194m^2

The velocity is given by

velocity=2.876 m/s