TITLE:
Comparison of One-Dimensional Analysis with Experiment for CO2 Two-Phase Nozzle Flow
AUTHORS:
Wakana Tsuru, Satoshi Ueno, Yoichi Kinoue, Norimasa Shiomi
KEYWORDS:
Carbon Dioxide, High-Speed Nozzle Flow, Gas-Liquid Two-Phase Flow with Phase Change, Blow down Test, One-Dimensional Analysis
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.4 No.5,
December
31,
2014
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.