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.

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