Scaling laws for jets of single cavitation bubbles

Supponen, Outi; Obreschkow, Danail; Tinguely, Marc; Kobel, Philippe; Dorsaz, Nicolas; Farhat, Mohamed

doi:10.1017/jfm.2016.463

Cited by 205 publications

(211 citation statements)

References 43 publications

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“…As has previously been established by numerous studies, with only a fraction listed here, the main microjet characteristics such as the jet speed, impact timing, bubble displacement, jet volume [45,46], as well as the shock wave strength (peak pressure and energy) [13,47] and the luminescence energy [48,49], vary as a function of the bubble's level of deformation.…”

Section: Introductionmentioning

confidence: 85%

“…We quantify this with an anisotropy parameter ζ, which represents a dimensionless equivalent of the linear momentum of the liquid accumulated at the bubble's collapse (Kelvin impulse) [43] and which is defined for different sources of bubble deformation, such as near surfaces and uniform pressure gradients [45,46]. With an increasing bubble deformation, i.e., with increasing ζ, the jet speed decreases and so does the resulting water hammer pressure and shock energy (up to ζ ∼ 0.1) [47].…”

Section: Introductionmentioning

confidence: 99%

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Rebounds of deformed cavitation bubbles

2018

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Presented here are experiments clarifying how the deformation of cavitation bubbles affects their rebound. Rebound bubbles carry the remaining energy of a bubble following its initial collapse, which dissipates energy mainly through shock waves, jets, and heat. The rebound bubble undergoes its own collapse, generating such violent events anew, which can be even more damaging or effective than at first bubble collapse. However, modeling rebound bubbles is an ongoing challenge because of the lack of knowledge on the exact factors affecting their formation. Here we use single-laserinduced cavitation bubbles and deform them by variable gravity or by a neighboring free surface to quantify the effect of bubble deformation on the rebound bubbles. Within a wide range of deformations, the energy of the rebound bubble follows a logarithmic increase with the bubble's initial dipole deformation, regardless of the origin of this deformation. 1 arXiv:1810.12287v1 [physics.flu-dyn] 29 Oct 2018 derstanding the underlying physics has motivated numerous studies to look at simplified case studies, especially involving the first collapse of single cavitation bubbles in various conditions. A great deal is indeed known about these bubbles and how they are able to emit microjets moving at hundreds of meters per second [11,12], shock waves with peak pressures reaching thousands of atmospheres [13][14][15], and luminescence, i.e., light emission due to the extreme heating of the bubble interior reaching thousands of degrees in temperature [16,17].Our understanding of these processes comes from the combination of experimental studies, often using laser- [13,[18][19][20], spark-[21-23], or ultrasound-induced [24, 25] cavitation bubbles; numerical studies typically using boundary integral methods [18,[26][27][28][29][30] and domain methods [31][32][33][34][35]; and analytical studies, most of them considering bubbles collapsing spherically [36][37][38][39][40][41][42] but some also tackling non-spherical bubble shapes, for example, by using the concept of Kelvin impulse [43,44].Non-sphericity adds a lot of complexity to the modeling of the bubble collapse. We also do not precisely know the composition, the quantity, the source, or the behavior of the gaseous contents of a typical cavitation bubble in its most extreme collapse conditions, making accurate modeling even more challenging. During the final stages of the collapse, these bubble contents are violently compressed and act as a spring, making the bubble interface bounce off them and forming thus a rebound bubble. The rebound's characteristics (for instance, its geometry or distance to a surface) often vary from those of the first bubble oscillation, and its ensuing collapse can lead to effects that are comparable or even more damaging. It is therefore important to understand the physics underlying multiple bubble oscillations, which is not yet fully understood. Many theoretical and numerical studies rely on experimental observations to model the rebound bubble, of which the formation ...

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Rebounds of deformed cavitation bubbles

2018

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“…The results in Fig. 11 were produced by using computational code that simulates asymmetric bubble cavitation [161]. The fluid is assumed to be incompressible, inviscid and irrotational, and surface tension is neglected.…”

Section: Regimes Of Extreme Nonlinear Acoustic Eventsmentioning

confidence: 99%

“…Note that the free surface is perturbed by the changes in the bubble's shape and its eventual collapse. The coordinates are in the units of the maximum bubble radius [161]. The interaction of the incident light with the bubble and the adjacent surface provide access to giant nonlinearities.…”

Section: Fig 11: Simulation Of An Asymmetric Cavitation Bubble Durinmentioning

confidence: 99%

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Coupling light and sound: giant nonlinearities from oscillating bubbles and droplets

Maksymov

Greentree

2019

Nanophotonics

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Nonlinear optical processes are vital for fields including telecommunications, signal processing, data storage, spectroscopy, sensing, and imaging. As an independent research area, nonlinear optics began with the invention of the laser, because practical sources of intense light needed to generate optical nonlinearities were not previously available. However the high power requirements of many nonlinear optical systems limit their use, especially in portable or medical applications, and so there is a push to develop new materials and resonant structures capable of producing nonlinear optical phenomena with low-power light emitted by inexpensive and compact sources. Acoustic nonlinearities, especially giant acoustic nonlinear phenomena in gas bubbles and liquid droplets, are much stronger than their optical counterparts. Here, we suggest employing acoustic nonlinearities to generate new optical frequencies, thereby effectively reproducing nonlinear optical processes without the need for laser light. We critically survey the current literature dedicated to the interaction of light with nonlinear acoustic waves and highly-nonlinear oscillations of gas bubbles and liquid droplets. We show that the conversion of acoustic nonlinearities into optical signals is possible with low-cost incoherent light sources such as lightemitting diodes, which would usher new classes of low-power photonic devices that are more affordable for remote communities and developing nations, or where there are demanding requirements on size, weight and power. . 1: (a) Generation of new optical frequencies via a nonlinear optical interaction. High-power monochromatic laser light interacts with the nonlinear optical medium, e.g. a dielectric microresonator, to generate new optical frequencies [9]. (b, c) The nonlinear properties of sound can be used to generate optical nonlinearities without the need for high-power laser light. Low-power light couples to a sound wave via a deformable fluid, e.g. gas bubble or liquidmetal nanoparticle, exploiting strong nonlinear acoustic effects. This converts acoustic frequencies to the optical domain, effectively reproducing the result of the nonlinear optical interaction in (a). Images from www.freeimages.com and www.dreamstime.com. FIG

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