Air flows through a system like the one shown in Figure 1 at a rate of 3 kg/s. If the flow is is throttled at the outlet of the duct and considering that the duct is circular, calculate: a) the Mach number at the entrance of the constant area section b) the pressure in the tank c) how much the duct must be extended to reach sonic conditions at the outlet if the nozzle is eliminated convergent output d) explain how you could achieve the same output conditions with a non-adiabatic section with shorter friction without changing input conditions.

Figura 1