Experimental study of interaction between bubble and free surface

Abstract

As a bubble moves near different boundaries, the motion characteristic will change largely compared with the condition of free field, especially near the free surface: there will appear a complex phenomenon because of the interaction. This paper aims to investigate experimentally the phenomenon and the regularity of the interaction between bubble and free surface. Using a spark-generated device and a high-speed camera, the influences of free surface on the maximal radius, period, jet time and width of the bubble are discussed. The relation between the voltage and the maximal radius is obtained. Different typical phenomena near the free surface are observed. The factors inducing different plume phenomena are obtained. Then the regurality of maximal height of the water column varying with dimensionless distance under the same initial condition is obtained, which provides a reference to the research on the interaction between bubble and free surface.