Abstract
Planar laser-induced fluorescence (PLIF) is widely applied to investigate annular flow, but it is affected by the pipe wall and complex interface waves. In this article, the main sources of distortions for PLIF imaging in annular flow are discussed. In existing papers, the distortion caused by the total reflection is corrected through optical path analysis based on the assumption that the liquid film is smooth and uniform, but the gas–liquid interface usually fluctuates. The correction model needs to be further improved to correct the distortion caused by total reflection. The experimental method PLIF70 without the refraction matching box is analyzed to investigate the effects of configuration and measurement angle on the distortion. Finally, a novel method which can suppress the effect of the total internal reflection by reducing the measurement angle is proposed, which has a better performance even under complex interface waves. Moreover, the effect of measurement angle on PLIF imaging in annular flow is discussed.
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