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 blown down into atmosphere through a divergent-convergent nozzle, where the mainstream profile of temperature was measured. Furthermore, velocity measurements of nozzle flow were conducted using by PIV system. Experimental data of both temperature and velocity show that the nozzle flow is considered to be supersonic flow. The experimental values of velocity are found to locate between the gas velocity and the liquid velocity of the 1-dimensional analysis by Kinoue et al.
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