CHARACTERISTICS AND BEHAVIOR OF THE INTERFACIAL WAVE ON THE LIQUID-FILM IN A VERTICALLY UPWARD AIR-WATER 2-PHASE ANNULAR-FLOW

The behavior of individual interfacial waves on liquid film in vertica lly upward air-water annular flows has been visualized, observed and a nalyzed by a pigment luminance method(PLM) which was calibrated with a fiber-optic liquid film sensor. By means of this technique, we distin guished three different types of interfacial waves, i.e. the ripple wa ve, the ring wave and the disturbance wave. Furthermore we measured th e characteristics of these three different kinds of waves, and in part icular those of the disturbance wave: i.e. its propagation velocity, i ts frequency in passing and the distance between two adjacent waves, a nd then obtained the dependency of these characteristics on the air an d water volumetric fluxes j(g) and j(l). These results agreed well wit h the results obtained by other investigators, using an electric needl e contact method. A probable mechanism of the occurrence of the ring a nd the disturbance waves was posited.