Visualization and Analysis of Liquid Film in Vertically Upward Air-Water Annular Flow by Pigment Luminance Method

Abstract

The behavior of interfacial wave on liquid film in vertically upward airwater annular flows has been observed and analized by a pigment luminance method. As a result, it has been shown that interfacial waves were apparently classified into three types, i.e. a base wave, a high-speed wave and a disturbance wave in terms of their wave-forms and propagation velocities. The base wave exists at any time and any place. The high-speed wave has the fastest velocity of the three and often appears behind the disturbance wave. The disturbance wave is a group of many kinds of interfacial waves and alternately merges and splits.