Analysis of sound pressure levels generated by nozzle-emitted large bubbles

• DOI: 10.1121/10.0010377
• Publication Date: 2022-05-17T12:19:54Z
• Authors: Filippo Nelli; Grant Deane; Andrew Ooi; Richard Manasseh
• Keywords: Sound; 0103 physical sciences; Pressure; Water; Acoustics; 01 natural sciences

The sound radiated by newly formed bubbles can be used to determine their properties. However, details of the fluid dynamics driving the acoustic emission remain unclear. A neck-collapsing model has been proposed to explain the sound generation at bubble pinch-off. The model uses a forcing function which drives the Rayleigh-Plesset equation and is linked to the bubble acoustic pressure. Here, the model is tested on bubbles of diameter up to 7 mm generated in distilled water, tap water, and alcohol-water solution. The model works well for bubbles less than 2.2 mm radius but the error increases up to 71% for larger diameters.