Refrigerant-134a enters an insulated nozzle at 25.0 psia, 80.0°F, and 10.0 ft/s. The flow accelerates and reaches 15.0 psia and 60.0°F just before it exits the nozzle.
The process is adiabatic and steady flow.
a. What is the exit velocity?
b. Is the flow reversible or irreversible?