Abstract
The aim of this study is to investigate CO2 two-phase nozzle flow in terms of both experimental and analytical aspects for the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector. In the experiment, it is measured that the temperature profile in the stream-wise direction of a divergent-convergent nozzle through which CO2 in the supercritical pressure condition is blown down into the atmosphere. In the analysis, a one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium is proposed. In the convergent part of the nozzle the flow is treated as single-phase flow of liquid, whereas in the divergent part the flow is treated as separated two-phase flow with saturated condition. The analytical results indicate that the temperature and the pressure decrease rapidly in the divergent part, and the void fraction increases immediately near the throat. Although this analysis is quite simple, the analytical results can follow the experimental results well within this study.
Highlights
In recent years, natural refrigerants are regarded as refrigerants of refrigeration cycles
Wasted available energy which is discarded in a pressure reduction process at an expansion valve in the cycle of using CO2 is three times as much as that of using R-134a
A two-phase flow ejector consists of a driving flow nozzle, a suction chamber, a mixing section and a diffuser, respectively
Summary
Natural refrigerants are regarded as refrigerants of refrigeration cycles. Wasted available energy which is discarded in a pressure reduction process at an expansion valve in the cycle of using CO2 is three times as much as that of using R-134a. It is important to recover the available energy, How to cite this paper: Tsuru, W., Ueno, S., Kinoue, Y. and Shiomi, N. A two-phase flow ejector consists of a driving flow nozzle, a suction chamber, a mixing section and a diffuser, respectively. Many researches for single-phase flow ejectors have been carried out. This study is carried out on a gas-liquid two-phase flow nozzle (two-phase flow nozzle) of a driving nozzle flow section which is the most important section
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