The bursting of a toroidal bubble at a free surface

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, PR China
  • State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116000, PR China

Abstract

This paper is concerned with the bursting of a large bubble at a free surface. The numerical modelling is based on the boundary integral method. To validate the numerical model, experiments are carried out for the bursting of a spark generated bubble at a free surface in a low pressure tank, captured by using a high speed camera. Our numerical results agree qualitatively with the experiments. We further carry out numerical analysis for the bursting of an underwater explosion bubble at a free surface. We have considered the bursting of singly connected bubbles as well as toroidal bubbles. When a bubble is initiated very close to a free surface, the bursting occurs during the expansion phase, thus, resulting in a cone shaped spike at the free surface. However, when the bubble is initiated away from the free surface, it expands and collapses below the free surface and rises to the free surface due to buoyancy. An upward liquid jet forms during the later stage of collapse, which subsequently penetrates through the bubble. The toroidal bubble rises and bursts at the free surface, which results in a much higher water column due to the high speed bubble jet.

Details

Original languageEnglish
Pages (from-to)611-622
JournalOcean Engineering
Volume109
Early online date22 Oct 2015
Publication statusPublished - 15 Nov 2015

Keywords

  • Bubble bursting at a free surface, Bubble dynamics, Toroidal bubbles, Potential flow theory, Boundary integral methods