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Formation of single bubbles controlled with fluctuating gas pressure

机译：形成具有波动气压的单个气泡

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A method of a bubble production, originally developed by Kariyasaki and Osaka [Trans. JSME, 68-674B(2002)], is further investigated experimentally. First, the acoustic characteristic of the pipe between audio speaker and nozzle is investigated. Then, a new type of fluctuation consisted of both increase and decrease in gas pressure is used to clarify the effect of the fluctuation. Shrinking motion of a capillary bridge connecting a bubble and a nozzle was observed in detail using high-speed photography. We also estimate the force balance on a bubble center based on a spherical bubble formation model. As results, it is clarified that the pipe between speaker and nozzle could regard as acoustic tube. Moreover, when gas pressure is decreased the capillary bridge is sucked down into a nozzle and upward added mass force is applied on a bubble center, both of which cause the detachment of a bubble from a nozzle.
机译：一种泡沫生产的方法，最初由Kariyasaki和Osaka [Transa。 JSME，68-674B（2002）]进一步实验研究。首先，研究了音频扬声器和喷嘴之间的管道的声学特性。然后，用于增加气压的增加和降低的新类型波动用于阐明波动的效果。使用高速摄影详细说明连接泡沫和喷嘴的毛细管桥的收缩运动。我们还估计基于球形气泡形成模型的泡沫中心的力平衡。结果，阐明了扬声器和喷嘴之间的管道可以作为声管。此外，当气体压力降低时，毛细管桥被吸入喷嘴，并在气泡中心施加向上添加的质量力，这两者都导致从喷嘴脱离气泡。

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