an air tank has a volume of 1.5 cubic meters with an initial pressure of 800 kpa and 20 c. it exhausts through a converging nozzle with a throat area of 0.75 square centimeters. what is the initial mass flow rate in kg/s? how long will it take for the pressure to reach 500 kpa? how long will it take before the nozzle flow ceases being choked? section 9.4, especially choked flow. mdot from eq 9.46 for choked.. what will the exit temperature be? write an unsteady energy equation and combine it with gas law to find time to reach subsonic throat.
