Multiple observations of cavitation cluster dynamics close to an ultrasonic horn tip

Birkin, Peter R.; Offin, Douglas G.; Vian, Christopher J. B.; Leighton, Timothy G.

doi:10.1121/1.3650536

Cited by 50 publications

(32 citation statements)

References 65 publications

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“…At the moment of maximum transmission of the laser through the oil, a set of transient events are also detected in the laser scattering data. This has been observed before in water based systems 37 and corresponds to the response of the bubble population to the PS event. Briefly, bubbles within the media are compressed and rebound (resulting in transient changes in laser transmission through the oil, in this case).…”

Section: Please Do Not Adjust Marginssupporting

confidence: 74%

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Birkin

Foley

Truscott

et al. 2017

Phys. Chem. Chem. Phys.

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Cavitation clusters and streamers are characterised in lipid materials (specifically sunflower oil) and compared to water systems. The lipid systems, which are important in food processing, are studied with high-speed camera imaging, laser scattering and pressure measurements. In these oils, clusters formed at an aged (roughened) tip of the sound source (a piston like emitter, PLE) are shown to collapse with varied periodicity in relation to the drive amplitude employed. A distinct streamer (an area of increased flow emanating from the cavitation cluster) is seen in the lipid media which is collimated directly away from the tip of the PLE source whereas in water the cavitation plume is visually less distinct. The velocity of bubbles in the lipid streamer near the cluster on the order of 10 m s -1. Local heating effects, within the streamer, are detected using a dual thermocouple measurement at extended distances. Viscosity, temperature and the outgassing within the oils are suggested to play a key role in the streamer formation in these systems.

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Section: Please Do Not Adjust Marginssupporting

confidence: 74%

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Birkin

Foley

Truscott

et al. 2017

Phys. Chem. Chem. Phys.

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“…The technique is however equally applicable to scenarios involving underwater explosions or industrial erosion, which might be undesirable [8] or required, as with ultrasonic cleaning [9,10]. One feature of these studies is that, while simulations of such events usually focus on the responses of single bubbles, the practical phenomena often involve clouds of interacting bubbles, and the collective response of the cloud might be key to the resulting erosion that is generated [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device

et al. 2013

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This study presents the key simulation and decision stage of a multi-disciplinary project to develop a hospital device for monitoring the effectiveness of kidney stone fragmentation by shock wave lithotripsy (SWL). The device analyses, in real time, the pressure fields detected by sensors placed on the patient's torso, fields generated by the interaction of the incident shock wave, cavitation, kidney stone and soft tissue. Earlier free-Lagrange simulations of those interactions were restricted (by limited computational resources) to computational domains within a few centimetres of the stone. Later studies estimated the far-field pressures generated when those interactions involved only single bubbles. This study extends the free-Lagrange method to quantify the bubblebubble interaction as a function of their separation. This, in turn, allowed identification of the validity of using a model of non-interacting bubbles to obtain estimations of the far-field pressures from 1000 bubbles distributed within the focus of the SWL field. Up to this point in the multi-disciplinary project, the design of the clinical device had been led by the simulations. This study records the decision point when the project's direction had to be led by far more costly clinical trials instead of the relatively inexpensive simulations.

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“…It is known that the prolonged effect of bubbles collapsing close to surfaces can lead to erosion or destruction of the surface, depending on different factors, such as the type of cavitation: inertial or stable. For this reason it is important to ensure that the duration of the cleaning process, and the applied process parameters, such as the pressure amplitude and frequency, allow for certain degree of control over the desired cleaning while avoiding the damaging behavior [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic cleaning of 3D printed objects and Cleaning Challenge Devices

Verhaagen¹,

Zanderink

Rivas

2016

Applied Acoustics

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a b s t r a c tWe report our experiences in the evaluation of ultrasonic cleaning processes of objects made with additive manufacturing techniques, specifically three-dimensional (3D) printers. These objects need to be cleaned of support material added during the printing process. The support material can be removed by dissolution in liquids with or without ultrasonic cavitation.Distinctive stages in the cleaning processes were found for two different liquids (water and NaOH solutions). The combination of ultrasound and high concentration of NaOH has the best results for support material dissolution in the particular conditions studied.The sonication of cleaning processes in ultrasonic baths is typically a slow process. Here we show the advantages of using an ultrasonic horn to clean the surface of small parts and holes more effectively.We introduce a Cleaning Challenge Device design to be used for the universal evaluation of cleaning performance of different equipment or processes, and specifically for ultrasonic baths. The results and conclusions can be of use for different cleaning situations besides 3D printed parts, such as when deciding which protocol has a better performance or comparing different equipment.

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Multiple observations of cavitation cluster dynamics close to an ultrasonic horn tip

Cited by 50 publications

References 65 publications

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device

Ultrasonic cleaning of 3D printed objects and Cleaning Challenge Devices

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