The Freely-oscillating Bubble

Leighton, T.G.

doi:10.1016/b978-0-12-441920-9.50008-0

Cited by 21 publications

(29 citation statements)

References 188 publications

(365 reference statements)

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“…This liquid jet is postulated to play a role in stimulating the acoustic emission. 19,30 The liquid jet was found for all tested conditions. Interestingly, the initial velocity and maximum height of the jet seem to be independent of the presence of frothers, with consistent values of 148 mm/s and 1.11 mm, respectively, being recorded.…”

Section: ■ Discussionmentioning

confidence: 88%

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Using Sound To Study the Effect of Frothers on the Breakaway of Air Bubbles at an Underwater Capillary

Chu

Pax²,

et al. 2017

Langmuir

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Frothers, a class of surfactants, are widely employed in froth flotation to aid the generation of small bubbles. Their action is commonly explained by their ability to hinder coalescence. There are occasional references suggesting that the frother may also play a role in the initial breakup of the injected air mass. This work investigates the possible effect of the frother on breakup by monitoring air bubbles produced quasi-statically at an underwater capillary. Under this condition, breakup is isolated from coalescence and an impact of frothers on the detached bubble can be ascribed to an impact on breakup. The breakaway process was monitored by an acoustic technique along with high-speed cinematography. The results showed that the presence of frothers did influence the breakaway process and that the acoustic technique was able to detect the impact. It was demonstrated that the acoustic frequency and acoustic damping ratio depend upon the frother type and concentration and that they are associated with a liquid jet, which initially excites the bubble and then decays to form a surface wave. The addition of the frother did not influence the formation of the jet but did increase its decay rate, hence, dampening the surface wave. It is postulated that the action of the frother is related to an effect on the magnitude of surface tension gradients.

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Section: ■ Discussionmentioning

confidence: 88%

“…At the instant of breakaway, an axial liquid jet forms, which travels extremely fast upward into the bubble to compensate for the inward liquid flow toward the axis. This liquid jet is postulated to play a role in stimulating the acoustic emission. , …”

Section: Discussionmentioning

confidence: 99%

Using Sound To Study the Effect of Frothers on the Breakaway of Air Bubbles at an Underwater Capillary

Chu

Pax²,

et al. 2017

Langmuir

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“…It is the snapping of the bubble neck that is of most interest to us as it results in a jet of water being momentarily propelled into the bubble, triggering an initial volume oscillation. This volume oscillation is ultimately what results in the acoustic signal of a bubble release [1][2][3] .…”

Section: The Injection Of a Gas Bubblementioning

confidence: 99%

“…This chapter discusses the sounds emitted by gas bubbles when they are generated underwater. Here we define bubbles to be volumes of gas, surrounded by liquid (here, taken to be water), having surface tension forces (the socalled Laplace pressure) generated by a single wall, and so are distinguished from the soap bubbles familiar in children's games, where the volume of gas is surrounded by two gas/liquid boundaries 1 . In comparison with other acoustic sources, such as marine mammals, ships and tectonic events, a single bubble may seem insignificant.…”

mentioning

confidence: 99%

Chapter 5: Ambient Bubble Acoustics -Seep, Rain and Wave Noise

Roche

Leighton

White

et al. 2022

Preprint

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“…1. Undamped linear natural frequency of an air-filled microbubble as a function of diameter calculated using Minnaert's equation [214].…”

Section: Counting and Sizing A Introductionmentioning

confidence: 99%

Characterization of Contrast Agent Microbubbles for Ultrasound Imaging and Therapy Research

Mulvana

Browning

Luan

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The high efficiency with which gas microbubbles can scatter ultrasound compared with the surrounding blood pool or tissues has led to their widespread employment as contrast agents in ultrasound imaging. In recent years, their applications have been extended to include super-resolution imaging and the stimulation of localized bio-effects for therapy. The growing exploitation of contrast agents in ultrasound and in particular these recent developments have amplified the need to characterize and fully understand microbubble behavior. The aim in doing so is to more fully exploit their utility for both diagnostic imaging and potential future therapeutic applications. This paper presents the key characteristics of microbubbles that determine their efficacy in diagnostic and therapeutic applications and the corresponding techniques for their measurement. In each case, we have presented information regarding the methods available and their respective strengths and limitations, with the aim of presenting information relevant to the selection of appropriate characterization methods. First, we examine methods for determining the physical properties of microbubble suspensions and then techniques for acoustic characterization of both suspensions and single microbubbles. The next section covers characterization of microbubbles as therapeutic agents, including as drug carriers for which detailed understanding of their surface characteristics and drug loading capacity is required. Finally, we discuss the attempts that have been made to allow comparison across the methods employed by various groups to characterize and describe their microbubble suspensions and promote wider discussion and comparison of microbubble behavior.

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The Freely-oscillating Bubble

Cited by 21 publications

References 188 publications

Using Sound To Study the Effect of Frothers on the Breakaway of Air Bubbles at an Underwater Capillary

Using Sound To Study the Effect of Frothers on the Breakaway of Air Bubbles at an Underwater Capillary

Chapter 5: Ambient Bubble Acoustics -Seep, Rain and Wave Noise

Characterization of Contrast Agent Microbubbles for Ultrasound Imaging and Therapy Research

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