Study on transient characteristics and influencing of temperature on cavitation bubbles in various environments

Abstract

Cavitation bubbles are widely studied in the fields of hydraulic machinery, medicine, biology and so on. This paper studies different dynamic characteristics of cavitation bubbles in infinite domain and attached to a solid wall. The maximum bubble diameter and bubble wall velocity increased with increasing laser energies, which were measured by Matlab software. The bubble pulses several times in infinite domain due to its kinetic energy loss decreases with higher laser energy. However, the fluctuation rules of maximum bubble diameter and bubble wall velocity under different ambient temperatures are different in two conditions. The bubble diameter decreases with the increasing temperature in infinite domain, and the decreasing rate slows down in each oscillation period. An approximate linear relation was proposed to describe the relationship between the maximum bubble diameter and the ambient temperature. Nevertheless, both the bubble diameter and bubble wall velocity increase with the increasing ambient temperature on the solid boundary, which can be ascribed to the decline in liquid viscosity, and the increased phase transition rate on the bubble surface. In addition, the cavitation erosion effect and the variation trend of bubble collapse time under different ambient temperatures was analyzed.