Ancient record of changing flows from wave ripple defects (original) (raw)
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ABSTRACT: Entrainment of liquid from liquid film surface in annular gas-liquid flow exerts essential influence on the integral characteristics of flow. Entrainment occurs due to interaction of large-scale disturbance waves and small-scale ripples [1]. Recently, experimental system for field measurements of liquid film thickness was developed based on laser-induced fluorescence technique [2]. Analysis of both spatial and temporal evolution of film surface showed that the ripples are generated at the back slopes of the disturbance waves. Subsequently, the ripples can either travel over the base film between the disturbance waves (‘slow ripples’), or travel over disturbance waves (‘fast ripples’). Disappearance of the fast ripples was related to the scattering of the fast ripples by the gas shear into droplets.
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