Mechanics of collapsing cavitation bubbles

Wijngaarden, L. van

doi:10.1016/j.ultsonch.2015.04.006

Cited by 115 publications

(51 citation statements)

References 12 publications

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“…Such regimes greatly enhance sonochemical reactions when compared with conventional sonoreactors (Fernandez Rivas et al 2010, 2012a, 2013b. The pressure oscillations produced are also able to generate microcavitation in the surroundings of the bubble, which can be used to remove undesirable elements (Fernandez Rivas et al 2012b), but also cause erosion (Fernandez Rivas et al 2013a;van Wijngaarden 2016).…”

Section: R Bolaños-jiménez and Othersmentioning

confidence: 99%

“…Removing contamination from surfaces or cleaning inaccessible cavities can be achieved with ultrasound-driven microbubbles (Otto et al 2011;van Wijngaarden 2016). For example, the decontamination of medical instruments in hospitals and dental clinics is often preceded by a thorough ultrasonic cleaning.…”

Section: R Bolaños-jiménez and Othersmentioning

confidence: 99%

“…It is now accepted that standard ultrasonic cleaning is mainly driven by jets formed during bubble collapse close to a solid surface, but the role of shockwaves cannot be neglected (van Wijngaarden 2016). Dijkink & Ohl (2008) obtained careful measurements of the pressure and shear stress exerted by a jet on a wall, yielding maximum values of 3.5 kPa.…”

Section: R Bolaños-jiménez and Othersmentioning

confidence: 99%

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Streaming flow by oscillating bubbles: quantitative diagnostics via particle tracking velocimetry

et al. 2017

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Oscillating microbubbles can be used as microscopic agents. Using external acoustic fields they are able to set the surrounding fluid into motion, erode surfaces and even to carry particles attached to their interfaces. Although the acoustic streaming flow that the bubble generates in its vicinity has been often observed, it has never been measured and quantitatively compared with the available theoretical models. The scarcity of quantitative data is partially due to the strong three-dimensional character of bubble-induced streaming flows, which demands advanced velocimetry techniques. In this work, we present quantitative measurements of the flow generated by single and pairs of acoustically excited sessile microbubbles using a three-dimensional particle tracking technique. Using this novel experimental approach we are able to obtain the bubble's resonant oscillating frequency, study the boundaries of the linear oscillation regime, give predictions on the flow strength and the shear in the surrounding surface and study the flow and the stability of a two-bubble system. Our results show that velocimetry techniques are a suitable tool to make diagnostics on the dynamics of acoustically excited microbubbles.

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Section: R Bolaños-jiménez and Othersmentioning

confidence: 99%

Section: R Bolaños-jiménez and Othersmentioning

confidence: 99%

Section: R Bolaños-jiménez and Othersmentioning

confidence: 99%

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Streaming flow by oscillating bubbles: quantitative diagnostics via particle tracking velocimetry

et al. 2017

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“…Acoustic and hydrodynamic cavitation have been the object of intense research from a fundamental 1,2 and an industrial perspective. [3][4][5][6][7] Whether using ultrasound or hydraulic machineries, the basic mechanisms leading to the intense collapse of bubbles are similar.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the collapse of bubbles after the impact of a piston on a liquid free surface

et al. 2017

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We describe a novel technique based on the impact of a piston on a liquid confined in a vessel. Pressure measurements reveal that strong pressure variations (up to 100 atmospheres) with a rich content of frequencies are efficiently transmitted to the liquid. High-speed camera visualizations show that pre-existing millimetric bubbles always collapse during the first instants of the impact whereas the behavior of submillimetric bubbles depends on the features of the pressure evolution in the system. In addition to the impact velocity, the amount of * Corresponding author: fuster@dalembert.upmc.fr 1 gas/vapor trapped between the piston and the liquid's surface plays an important role on how pressure evolves. Only when negative pressure occurs bubbles grow significantly and collapse. The violent collapse of bubbles promote turbulence and mixing at very small length-scales which renders this technique interesting to intensify processes limited by heat and mass diffusion.

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“…The destructive action of collapsing cavitation bubbles is due to the shock waves emitted after the first rebound of a collapsing bubble and due to microjets formed by bubbles collapsing near a solid wall (van Wijngaarden, 2016). The collapse of these cavitation bubbles near a rigid boundary results in high-speed reentrant liquid jets, which penetrate the bubbles and strike the nearby boundary generating water hammer like impact pressures.…”

Section: Introductionmentioning

confidence: 99%

Cavitation Bubbles Remove and Inactivate Listeria and Salmonella on the Surface of Fresh Roma Tomatoes and Cantaloupes

Lee

Eifert

Jung

et al. 2018

Front. Sustain. Food Syst.

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Raw produce has frequently been identified as the source of bacterial pathogens that can cause human illnesses, including listeriosis and salmonellosis. Microbial pathogens may attach and form biofilms on raw fruit surfaces and can be difficult to remove. A cavitation process (injection of bubbles into water) was studied for its effectiveness for removal and inactivation of Listeria monocytogenes and Salmonella Newport from the surfaces of fresh Roma tomatoes and cantaloupes. Individual fruit were separately inoculated with each pathogen, then submerged in a water tank and treated with a bubble flow through an air stone using one airflow rate (0-14 liters/min.) for up to 60 s. As airflow increased, L. monocytogenes reduction on tomato and cantaloupe surfaces increased up to 1.2 and 0.8 log CFU/fruit greater than with water alone (no bubbles), respectively. With a 14 L/min flow rate, Salmonella reduction on tomato and cantaloupe surfaces increased up to 0.9 and 0.7 log CFU/fruit greater than when no bubbles applied, respectively. Also, with the bubble treatments, additional pathogen reduction (detached organisms) was observed in the tank water. Therefore, these bubble streams can be used to enhance the detachment of bacteria from fruit surfaces and to inactivate a proportion of these detached microorganisms. Additionally, recoveries of Salmonella from inoculated Roma tomatoes and cantaloupe were determined for treatment water that contained 50 or 150 ppm sodium hypochlorite. Combining both cavitating bubbles and 150 ppm chlorine in the tank water resulted in greater efficacy of removing or inactivating S. Newport from the surface of cantaloupe (2.9 log CFU) than with cavitation (2.5 log CFU) or chlorine (1.9 log CFU) alone. The physical force of a bubble stream on raw produce can effectively detach and inactivate surface bacteria, and has the potential to reduce antimicrobial chemical use and water use in post-harvest packing operations.

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Mechanics of collapsing cavitation bubbles

Abstract: Abstract.A brief survey is given of the dynamical phenomena accompanying the collapse of cavitation bubbles. The discussion includes shock waves , microjets and the various ways in which collapsing bubbles produce damage.

Cited by 115 publications

References 12 publications

Streaming flow by oscillating bubbles: quantitative diagnostics via particle tracking velocimetry

Streaming flow by oscillating bubbles: quantitative diagnostics via particle tracking velocimetry

Investigation of the collapse of bubbles after the impact of a piston on a liquid free surface

Cavitation Bubbles Remove and Inactivate Listeria and Salmonella on the Surface of Fresh Roma Tomatoes and Cantaloupes

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