Abstract
For the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector, it is important to investigate fluid mechanics of high-speed gas-liquid two-phase flow. The purpose of this study is to investigate CO2 two-phase nozzle flow in view of both experimental and analytical aspects. In the experiment, CO2 in supercritical pressure condition was blow down into atmosphere through a divergent-convergent nozzle, where the mainstream profile of temperature and the jet force at nozzle exit were measured. In the analysis, one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium was proposed. The flow in the nozzle of convergent part was treated as single-phase flow, whereas the flow in the nozzle of divergent part was treated as separated two-phase flow with saturation. Although this analysis is quite simple, the analytical results can follow the experimental results well within the cases in this study.
