Abstract
The purpose of this study is to develop a small wire mesh sensor for measurement of void fraction distribution in refrigerant-air two phase flow in order to clarify experimentally the two phase flow parameters. In this study, since we suppose HFE-71IPA for the liquid phase as one of the actual refrigerant, which can flow the small electric current under high voltage, the small wire mesh sensor for the high voltage has been developed. In this report, as a purpose of verification of flow regime difference for the small wire mesh sensor, instantanious and time averaged void fraction distribution in water-air two phase flow in vertical small diameter pipe was experimentally measured and analyzed for bubble and slug flows. In the experiment, the test channel was a vertical circular glass pipe of 9 mm i.d. The each volumetric flux were 0.2-2.0 m/s for the gas phase and 0.1 m/s for the liquid phase in bubble flow, and 0.5-1.0 for the gas phase and 0.2-0.5 m/s for the liquid phase in slug flow. In this report, the obtained void fraction distribution data were compared between different flow regimes, and with the past data and literatures.
