Liquid Film Thickness of Individual Bubbles in a Narrow Channel

Abstract

In this study, the electrical conductance method was applied to measure the liquid film thickness between the individual bubbles and the wall in a narrow channel. This method consists of two different conductance measurements. One measures the conductance between electrodes on an inner wall, and the film thickness is estimated. Other measures the conductance between two sensors which are instaled on the opposing wall of the channel. This conductance is related to void fraction in the gap. Therefore, two-dimensional distributions of the liquid film thickness and void fraction can be measured simultaneously.