Bubble Dynamics in Single Component Fluid

Abstract

The response of bubbles-cloud in thermodynamically meta-stable liquid influences all acoustic processes in multiphase flows. System computer codes with single pressure concept widely used in the industry does not take this into account. This paper demonstrates the need of extension of the existing computer codes to at least two-pressure concepts in order to adequately describe for instance condensation oscillations of steam in sub-cooled liquid. Review of the state of the art is given in Appendixes. The symmetric bubble dynamics mathematical description is proposed based on “two-phase” Rayleigh-Plesset equation together with analytical model for the bubble parameters and high accuracy numerical solution of the heat conduction problem. The model is validated on evaporation and condensation experiments. Finally self-triggered oscillation system is demonstrated for 5 mm bubbles in strong sub-cooled water resulting in high internal bubble pressure