Shear-wave generation from cavitation in soft solids

Rapet, Julien; Tagawa, Yoshiyuki; Ohl, Claus‐Dieter

doi:10.1063/1.5083141

Cited by 18 publications

(13 citation statements)

References 22 publications

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“…Based on the definition of and , one finds , indicating that the elastic Froude number is not only the ratio of sphere inertia to gelatine elasticity but also the competition between the speed of cavity formation (or surface creation) and the shear wave propagation in the gelatine. Note that the speed of the longitudinal wave in gelatine, which is supposed to be close to that of the compression wave in water, is still much greater than the sphere speed, suggesting that cavity dynamics in gelatine is affected by the shear wave (Rapet, Tagawa & Ohl 2019), where the contribution of the longitudinal wave to cavity dynamics in gelatine is supposed to be comparable to that of the compression wave in water.…”

Section: Observationsmentioning

confidence: 99%

Gelatine cavity dynamics of high-speed sphere impact

et al. 2019

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We investigate the impact and penetration of a solid sphere passing through gelatine at various impact speeds up to 143.2 m s −1 . Tests were performed with several concentrations of gelatine. Impacts for low elastic Froude number Fr e , a ratio between inertia and gelatine elasticity, resulted in rebound. Higher Fr e values resulted in penetration, forming cavities with prominent surface textures. The overall shape of the cavities resembles those observed in water-entry experiments, yet they appear in a different order with respect to increasing inertia: rebound, quasi-seal, deep-seal, shallow-seal and surface-seal. Remarkably, similar to the We-Bo phase diagram in water-entry experiments, the elastic Froude number Fr e and elastic Grashof number Gr e (a ratio between gravity and gelatine elasticity) classify all five different phenomena into distinguishable regimes. We find that Fr e can be a good indicator to describe the cavity length H, particularly in the shallow-seal regime. Finally, the evolution of cavity shape, pinch-off depth, and lower cavity radius are investigated for different Fr e values.

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Section: Observationsmentioning

confidence: 99%

Gelatine cavity dynamics of high-speed sphere impact

et al. 2019

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“…The position where the laser focused on was 2–3 mm away from the meniscus position (1 mm above the edge of the capillary tube). When the pulsed laser struck the liquid inside the capillary tube, the laser-induced bubble expanded quickly, inducing a shockwave 47 . As a result, a microjet is ejected 48 .…”

Section: Experimental Methodologymentioning

confidence: 99%

Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet

Miyazaki

Usawa

Kawai

et al. 2021

Sci Rep

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This study investigated the fluid–tissue interaction of needle-free injection by evaluating the dynamics of the cavity induced in body-tissue simulant and the resulting unsteady mechanical stress field. Temporal evolution of cavity shape, stress intensity field, and stress vector field during the injection of a conventional injection needle, a proposed highly focused microjet (tip diameter much smaller than capillary nozzle), and a typical non-focused microjet in gelatin were measured using a state-of-the-art high-speed polarization camera, at a frame rate up to 25,000 f.p.s. During the needle injection performed by an experienced nurse, high stress intensity lasted for an order of seconds (from beginning of needle penetration until end of withdrawal), which is much longer than the order of milliseconds during needle-free injections, causing more damage to the body tissue. The cavity induced by focused microjet resembled a funnel which had a narrow tip that penetrated deep into tissue simulant, exerting shear stress in low intensity which diffused through shear stress wave. Whereas the cavity induced by non-focused microjet rebounded elastically (quickly expanded into a sphere and shrank into a small cavity which remained), exerting compressive stress on tissue simulant in high stress intensity. By comparing the distribution of stress intensity, tip shape of the focused microjet contributed to a better performance than non-focused microjet with its ability to penetrate deep while only inducing stress at lower intensity. Dynamic mechanical interaction revealed in this research uncovered the importance of the jet shape for the development of minimally invasive medical devices.

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“…It consists of a microfluidic gap, a pulsed laser for generating the bubbles, and an imaging system. Submillimeter bubbles are nucleated with use of a pulsed laser following the classic laser-induced bubble method [23][24][25]. A microscope objective focuses the laser pulse into the upper surface of the liquid gap and the dynamics is imaged through it, too.…”

Section: A Experimental Setupmentioning

confidence: 99%

Cavitation Inception from Transverse Waves in a Thin Liquid Gap

2020

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It is well known that dielectric breakdown in a liquid generates cavitation bubbles and shock waves.Here we demonstrate that when the liquid is bounded by two solid glass boundaries (10-20-μm separation), rings of microscopic bubbles can be nucleated around the laser-induced cavitation bubble. While generally acoustic nucleation is achieved with longitudinal waves of sufficient tension, this work demonstrates that acoustic cavitation can also be generated from transverse waves. Our experiments identify three waves originating at the boundaries: the fastest is the bulk wave in the solid, followed by a leaky Rayleigh wave at the liquid-solid contact, which is trailed by a Lamb-type wave. For the latter, the two solid boundaries act as a wave guide and generate intense and short-lived cavitation activity within the gap. Streak photography and high-speed photography reveal the microsecond-duration cavitation-bubble dynamics, and subpicosecond strobe photography visualizes the mechanism of bubble nucleation from the accelerated surface. Simulations coupling the solid mechanics with the acoustics support the experimentally observed mechanisms of transverse-wave-induced cavitation inception.

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Shear-wave generation from cavitation in soft solids

Cited by 18 publications

References 22 publications

Gelatine cavity dynamics of high-speed sphere impact

Gelatine cavity dynamics of high-speed sphere impact

Dynamic mechanical interaction between injection liquid and human tissue simulant induced by needle-free injection of a highly focused microjet

Cavitation Inception from Transverse Waves in a Thin Liquid Gap

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