Investigation of Asymmetry in Horizontal Gas-Liquid Annular Flow Based on Planar Laser Induced Fluorescence

Abstract

Due to gravity, the circumferential liquid film distribution in horizontal annular flow is asymmetric, which has a significant effect on its heat and mass transfer performance. Planar laser induced fluorescence (PLIF) is applied to provide images of the circumferential liquid film in horizontal annular flow. The characteristics of fluorescence image are utilized to segment the liquid film by the color difference calculation. Based on the optical path analysis, the distortion of the liquid film is corrected to obtain the true liquid film, and then the method that extracts liquid film thickness at different circumferential positions from 30° to 150° is optimized. The circumferential liquid film during 300ms is combined to investigate the behavior of disturbance wave. The effects of superficial gas and liquid velocities on the circumferential film thickness and the asymmetry of liquid film distribution are analyzed.