A Study of Bubble Dynamics on the Dielectric Recovery Underwater Discharge

Abstract

In this paper, a numerical method was used to study the dielectric recovery characteristics underwater discharge. The Keller-Miksis equation was used to study the bubble evolution, considering the internal thermodynamic parameters. The temperature and pressure inside the bubble was estimated the second breakdown voltage. The calculated results showed the precise values for second breakdown voltage and recovery time. The second breakdown voltage was determined by the variation in internal temperature and pressure in gradual expansion-contraction stage, as well as in the initial collapse stage. The calculated voltages were in good agreement with the experimental results. The viscosity has effect on the recovery time, the lower viscosity results in a considerably shorter recovery time, while surface tension has little effect.