Influence of the nuclei size distribution on the collapsing behavior of the cloud cavitation

Abstract

Dynamics of a spherical bubble cloud with nuclei size distribution is investigated numerically when the surrounding pressure is decreased from 50 kPa to l0kPa and then increased to 50kPa stepwisely. A set of governing equations for the motion of bubble cloud are formulated combining the averaged equation and the equation of bubble motion with emphasis on the internal phenomena of each bubble. The nuclei size distribution has significant effects on the cloud dynamics in comparison with the results for mono-dispersed cloud. When the cloud contains multi-dispersed bubbles in their size, the maximum pressure in the bubbly mixture becomes lower than the case of mono-dispersed one. However, the maximum pressure emitted from each bubble has the same order with the mono-dispersed case. The range where high emitted pressure is observed is wider than the mono -dispersedcase.