Transient bubble oscillations near an elastic membrane in water

9th International Symposium on Cavitation

Turangan, C.K.^1 ; Khoo, B.C.^2

Fluid Dynamics, IHPC, 1 Fusionopolis Way, #16-16, Connexis, Singapore

138632, Singapore^1

Department of Mechanical Engineering, National University of Singapore, Singapore

119260, Singapore^2

关键词: Bubble surface;    Elastic interfaces;    Elastic membranes;    High-pressure and temperatures;    Oscillating bubbles;    Thin elastic membrane;    Transient bubbles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012040/pdf
DOI  :  10.1088/1742-6596/656/1/012040

来源: IOP

【 摘 要 】

We present a study of transient oscillating bubble-elastic membrane interaction by means of an experiment and a numerical simulation to study the dynamics of bubble's inertial collapse near an elastic interface. The bubble is generated very close to a thin elastic membrane using an electric spark, and their interaction is observed using high speed photography. The high pressure and temperature plasma from the dielectric breakdown precedes the bubble formation. The bubble then expands and creates a dimple on the membrane. After reaching its maximum size, the bubble begins to collapse. The membrane retracts back, transmitting a perturbation on the bubble surface. The coupling between bubble contraction and this perturbation strengthens the collapse and leads to the formation of a mushroom-shaped bubble, bubble pinching and splitting. Towards the end of the collapse, the water inertia surrounding the bubble pulls the membrane upwards forming a relatively sharp conical hump. The dynamics of this interaction is well predicted by the boundary element method (BEM) simulation.