High-Speed Gas-Liquid Two-Phase Nozzle Flow for CO₂ (Effect of Inlet Temperature)

Experimental and analytical investigations were made into the high-speed gas-liquid two-phase nozzle flow for CO₂. In order to examine the effect of inlet temperature of the nozzle, two cases are examined for 17 °C and 27 °C of ambient temperatures. The experimental pressure of CO₂ in the nozzle decreases remarkably, which shows suitable acceleration of CO₂ in the nozzle. As for the experimental temperature decrease in the nozzle, the temperature decrease for 27 °C of ambient temperature is much lower than the one for 17 °C of ambient temperature. One-dimensional analytical model is proposed, which assumes steady, adiabatic, frictionless and equilibrium. The flow in the nozzle of convergent part is treated as single-phase flow in the model, whereas the flow in the nozzle of divergent part is treated as separated two-phase flow with saturation in the model. Analytical values of temperature or pressure profile along the nozzle agree well with the experimental values for 27 °C of ambient temperature, whereas analytical values are lower than the experimental values for 17 °C of ambient temperature.