Two Phase Fluid Elements Cap (2P) Constant Volume Chamber (2P) Flow Resistance (2P) Infinite Flow Resistance (2P) Local Restriction (2P) Reservoir (2P) Controlled Reservoir (2P) Sensors Flow Rate Sensor (2P) Absolute Pressure, Temperature & Internal Energy Sensor (2P) Saturation Properties Sensor (2P) Thermodynamic Properties Sensor (2P) Vapor Quality Sensor (2P) Sources Controlled Mass Flow Rate Source (2P) Controlled Pressure Difference Source (2P)