2010 年 27 巻 2 号 p. 149-160
Optical fiber probing is one of the efficient and reliable measurement methods for gas-liquid two-phase flows. We employed the proving for the measurement of a liquid film inside a two-fluid nozzle. First, we verified the availability of the optical fiber probe in the measurement of the liquid film via calibration experiments and numerical analysis. It was validated that the average film thickness and the amplitude of the thickness fluctuation are measured correctly. Second, we performed two kinds of measurements using a steam-water two-fluid transparent nozzle; the one is the newly developed optical fiber probing stated above and the other is LIF visualization with a high-speed video camera. The following results were obtained from both measurements. The average thickness of the liquid film measured by the optical fiber probe was 61 μm and the amplitude of the liquid film fluctuation was 28 μm. These results were agreed with those obtained by the LIF visualization.