Estimated vapor quality and thermodynamic equilibrium vapor quality assuming isentropic/isenthalpic expansion at different axial locations for the cases without and with maximum inlet vortex at í µí±ƒ í µí±–í µí±› =925 kPa, í µí±‡ í µí±–í µí±› =36.0 °C, and í µí±ƒ í µí±œí µí±¢í µí±¡ =680 kPa The estimated fluid densities at the nozzle outlet for the cases without and with maximum vortex are 625 kg/m 3 and 367 kg/m 3 , respectively. Although the total mass flow rate through the nozzle with maximum vortex (12.6 g/s) is much lower than that without vortex (15.7 g/s), the fluid average axial velocity at the outlet with maximum vortex (22.3 m/s) is much higher than that without vortex (16.3 m/s) due to the much lower fluid density at the outlet. For inlet conditions of í µí±ƒ í µí±–í µí±› =925 kPa and í µí±‡ í µí±–í µí±› =36.0 °C and outlet pressure of 680 kPa, the isentropic nozzle outflow velocity V isentropic,out is 30.2 m/s. The isentropic efficiency of a nozzle is defined as follows:

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... the vapor quality at locations in the downstream can be computed. Figure 8 shows the vapor quality in the divergent part at different axial locations relative to the nozzle throat estimated with the above 1D model using the measured pressure and mass flow rate data for the cases without and with maximum inlet vortex at í µí±ƒ í µí±–í µí±› =925 kPa, í µí±‡ í µí±–í µí±› =36.0 °C (approximately 0.5 °C subcooling), and í µí±ƒ í µí±œí µí±¢í µí±¡ =680 kPa. The thermodynamic equilibrium vapor quality assuming isentropic/isenthalpic expansion at each location is also displayed. ...