Air flows adiabatically between sections 1 and 2 and isentropically between sections 2 and 3 as shown in Fig. 2. The pressure, temperature and velocity at section I are 200 kPa, 320 K and 150 m/s respectively. The drop in stagnation pressure between sections 1 and 2 (Po-Po2) = 10 kPa. The atmospheric pressure is 150 kPa. The exit area (As) is 0.001 m. Calculate the mass flow rate and the cross-sectional area of the adiabatic duct. Adiabatic Fig. 2 Isentropic