Question #1: It is required to produce a stream of Argon at the rate of 0.3 kg/s travelling at sonic velocity at a temperature of 15 °C. Assuming negligible inlet velocity, isentropic flow, and a back pressure of 2 bar, calculate:
i. the required inlet pressure and temperature;
ii. the exit area of the nozzle.
iii. Determine if Nozzle is choked
For Argon take the molar mass as 4 kg/kmol, and y = 1.66.
Question #2: Gases at pressure and temperature of 4bars and 300°C, respectively expands in a Convergent-Divergent nozzle to an exit pressure of 0.90 bar. The gas flows at a rate of 18kg/s.
Calculate
a. the required throat
b. exit areas of the nozzle.
c. State if 18kg/s is the maximum flow and give reason for your answer
Taking a coefficient of discharge of 0.89 and a nozzle efficiency of 0.84.
Assume that for the gases y = 1.333 and Cp = 1.11 kJ/kg K and consider the inlet velocity negligible.
