Cavitation and bubble dynamics: the Kelvin impulse and its applications

Blake, J. R.; Leppinen, David; Wang, Qianxi

doi:10.1098/rsfs.2015.0017

Cited by 99 publications

(82 citation statements)

References 35 publications

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“…As a result, a jet appears flowing through point “o” and pointing to the JM. In fluid dynamics, this is known as the cavitation-induced-jet arising from the asymmetry of the medium around the bubble [ 63 , 64 ], as shown by Figure 4 g. Considering the fact that the bubble and the JM usually do not locate in the same horizontal plane due to the difference of their density, the jet flow is not strictly in the horizontal plane. It is the horizontal component of the jet propelling the JM forward, as observed in Figure 4 g. The instantaneous speed of the fluid could reach 1 m/s, about one order of magnitude larger than the maximum speed of the JM.…”

Section: Fast Microbubble Propulsionmentioning

confidence: 99%

The Self-Propulsion of the Spherical Pt–SiO2 Janus Micro-Motor

et al. 2017

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The double-faced Janus micro-motor, which utilizes the heterogeneity between its two hemispheres to generate self-propulsion, has shown great potential in water cleaning, drug delivery in micro/nanofluidics, and provision of power for a novel micro-robot. In this paper, we focus on the self-propulsion of a platinum–silica (Pt–SiO2) spherical Janus micro-motor (JM), which is one of the simplest micro-motors, suspended in a hydrogen peroxide solution (H2O2). Due to the catalytic decomposition of H2O2 on the Pt side, the JM is propelled by the established concentration gradient known as diffusoiphoretic motion. Furthermore, as the JM size increases to O (10 μm), oxygen molecules nucleate on the Pt surface, forming microbubbles. In this case, a fast bubble propulsion is realized by the microbubble cavitation-induced jet flow. We systematically review the results of the above two distinct mechanisms: self-diffusiophoresis and microbubble propulsion. Their typical behaviors are demonstrated, based mainly on experimental observations. The theoretical description and the numerical approach are also introduced. We show that this tiny motor, though it has a very simple structure, relies on sophisticated physical principles and can be used to fulfill many novel functions.

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Section: Fast Microbubble Propulsionmentioning

confidence: 99%

The Self-Propulsion of the Spherical Pt–SiO2 Janus Micro-Motor

et al. 2017

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“…The fluid is assumed to be incompressible, inviscid and irrotational, and surface tension is neglected. The Navier-Stokes equations are solved using the boundary integral method [162].…”

Section: Regimes Of Extreme Nonlinear Acoustic Eventsmentioning

confidence: 99%

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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“…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.…”

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confidence: 99%

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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Cavitation and bubble dynamics: the Kelvin impulse and its applications

Cited by 99 publications

References 35 publications

The Self-Propulsion of the Spherical Pt–SiO2 Janus Micro-Motor

The Self-Propulsion of the Spherical Pt–SiO2 Janus Micro-Motor

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

Rebounds of deformed cavitation bubbles

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