Pflieger Rachel, Bertolo Julia, Gravier Léa, Nikitenko Sergey I, Ashokkumar Muthupandian
ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
Ultrason Sonochem. 2021 May;73:105532. doi: 10.1016/j.ultsonch.2021.105532. Epub 2021 Mar 20.
A powerful experimental approach to measure the size distribution of bubbles active in sonoluminescence and/or sonochemistry is a technique based on pulsed ultrasound and sonoluminescence emission. While it is an accepted technique, it is still lacking an understanding of the effect of various experimental parameters, including the duration of the pulse on-time, the nature of the dissolved gas, the presence of a gas flow rate, etc. The present work, focusing on Ar-saturated water sonicated at 362 kHz, shows that increasing the pulse on-time leads to the measurement of coalesced bubbles. Reducing the on-time to a minimum and/or adding sodium dodecyl sulfate to water allows to reducing coalescence so that natural active cavitation bubble sizes can be measured. A radius of 2.9-3.0 µm is obtained in Ar-saturated water at 362 kHz. The effects of acoustic power and possible formation of a standing-wave on coalescence and measured bubble sizes are discussed.
一种用于测量声致发光和/或声化学中活跃气泡尺寸分布的强大实验方法是基于脉冲超声和声致发光发射的技术。虽然这是一种公认的技术，但仍缺乏对各种实验参数影响的理解，包括脉冲开启时间的持续时间、溶解气体的性质、气体流速的存在等。目前的工作聚焦于在362kHz下超声处理的氩气饱和水，结果表明增加脉冲开启时间会导致测量到合并的气泡。将开启时间减至最短和/或向水中添加十二烷基硫酸钠可减少合并，从而能够测量自然活跃空化气泡的尺寸。在362kHz的氩气饱和水中获得的半径为2.9 - 3.0μm。讨论了声功率以及驻波的可能形成对合并和测量气泡尺寸的影响。
