19. helium gas is expanded polytropically in a turbine, from 4 bar, 3000c to 1 bar such that final volume is 2.5 times the volume at inlet. Velocity of gas at exit is 50 m/s. What is the mass flow rate of gas required to produce 1mw of turbine output? How much is the heat transfer during the process? Also determine exit area of turbine. Assume specific heat of helium=5.193 kj/kg0k at constant pressure.
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