High-frequency acoustic emission and single gas bubble burst

摘要

This technical note presents the results of the application of acoustic emission (AE) technology in detecting a single gas bubble burst event at a liquid-free surface. AE in this instance is defined as elastic waves within the frequency range of 100 kHz to 1 MHz. The experimental findings show that AE parameters such as amplitude (dB) and energy (J) can be related to bubble size. The successful detection of single bubble activity in this experiment can provide a basis for the application of AE technology to measuring bubble content in two-phase systems and is the first reported attempt at measuring such high frequencies associated with a bubble burst.