Experimental study on the interaction between bubble and free surface using a high-voltage spark generator

The experimental studies presented in this paper attempt to supply a reasonable comprehensive explanation for the key feature of the collapse bubble and the complex nature of the raised free surface. Six distinctive patterns of free surface motion were identified for bubbles initiated at different gamma(f) (the non-dimensional bubble-free surface distance scaled with the maximum bubble radius). Special features such as breaking wrinkles, spraying water film, and other unstable phenomena were observed with free surface motions, which were hardly captured by a boundary integral scheme. Parameters defining the shape of the free surface, such as the spike height H-spike, the spike width W-base, and the skirt height H-spray, are measured and analyzed against gamma(f). Different voltages were used to generate bubbles with varies sizes, while the bubble and free surface motion patterns appeared to be largely independent of the bubble size. Finally, collapsing bubble shape, centroid migration, period of bubble oscillation, and jet tip velocity at different gamma(f) are investigated and noticeable variation trends are found. (C) 2016 AIP Publishing LLC.