水中気泡から放射される音の発生メカニズムについて

抄録

Air bubble slowly released from an underwater nozzle was recorded with high-speed camera and measured by hydrophone in order to observe sound radiation. From experimental data the acoustic frequency which was called 'Breathing mode' was close to one calculated from Minnaert's equation and the lower frequency called 'Deformation mode' was 10~55% of the above basic frequency. CFD analysis was done with two models. One was the approximating bubble shape just after pinched off and another model was to be released from nozzle as same as experiment. There were some differences between two models such as pressure and mode shapes.