Shock wave emission during the collapse of cavitation bubbles

Garen, W.; Hegedűs, Ferenc; Kai, Yuichi; Koch, Sandra; Meyerer, B.; Neu, W.; Teubner, U.

doi:10.1007/s00193-015-0614-z

Cited by 30 publications

(14 citation statements)

References 10 publications

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“…Shock waves are also one of the reasons for the destruction of a material when a bubble collapses. This is because the surrounding fluid is highly squeezed and rebounds rapidly after the bubble collapses [16][17][18]. Because of the high pressure and high-speed jet generated when cavitation bubbles collapse, it has attracted widespread attention.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of Bubble Collapse Near the Liquid-Liquid Interface

Yin

Huang

et al. 2020

Water

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Bubble collapse near the liquid–liquid interface was experimentally studied in this paper, and the dynamic evolution of a laser-induced bubble (generation, expansion, and collapse) and the liquid–liquid interface (dent and rebound) were captured by a high-speed shadowgraph system. The effect of the dimensionless distance between the bubble and the interface on the direction of the liquid jet, the direction of bubble migration, and the dynamics of bubble collapse were discussed. The results show that: (1) The jet generated during bubble collapse always directs toward the denser fluid; (2) bubble collapses penetrate the interface when the bubble is close to the interface; (3) three different shapes of the liquid–liquid interface—that is, a mushroom-shaped liquid column, a spike droplet, and a spherical liquid droplet—were observed.

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Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of Bubble Collapse Near the Liquid-Liquid Interface

Yin

Huang

et al. 2020

Water

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“…However, this method may inclose problems in providing ill-defined conditions for shock wave onset and its propagation. As an example, LPP generation in a water-filled small capillary leads to cavitation bubbles with a rather complicate evolution and propagation with many reflections at the capillary walls [35,36].…”

Section: The Lims Methodsmentioning

confidence: 99%

Laser-plasma induced shock waves in micro shock tubes

et al. 2017

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Shock wave generation with help of lasers or shock tubes, for example, is a common subject at macroscopic scale. On the other hand, the current tendency towards smaller scales becomes more and more important. In particular, shock waves in small channels or tubes with sub-mm or micron-sized diameter have attracted much interest within the last years. But downscaling of shock wave effects such as pressure decrease and Mach number attenuation during propagation, viscous and heat effects, laminar and turbulent flow is not necessarily straightforward from macro to micro or even nano range. Although several theoretical investigations are available in this new field, there is a strong demand on experiments, which are mostly missing due to the lack of suitable methods. The present work introduces a novel method for the generation of shock waves at microscale, namely laserinduced micro shock waves (LIMS). The LIMS method applies a femtosecond laser to induce an optical breakdown in a thin aluminum target located at the entrance of a micro tube. Subsequently, a shock wave is launched by the high pressure aluminum plasma and starts propagating into the tube. The topical work presents, for the first time, experimental investigations on direct micro shock wave generation and propagation at well-defined conditions in micron-sized tubes. They are performed for different conditions and tubes down to 50 μm diameter. Different from previous shock wave investigations in the mm-diameter range that involve pressure transducers, the present work applies non-contact measurements by optical methods. The experiments are supported by additional simulations. A one-dimensional numerical hydrocode is applied to simulate the shock wave generation process. Further propagation of the shock in a micro tube is analyzed by solving twodimensional Navier-Stokes equations. Both simulations agree well with the experimental results. Nomenclature L t laser pulse duration (fs-laser) E L laser pulse energy (fs-laser)

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“…Both phenomena, inducing very quick vaporization and condensation of cavitating vortical structures, might possibly generate shock waves 40 into the test section with potential erosions 41 and interactions with attached cavities. To illustrate the "patch" cavitation and the continuous vortex cavitation, we focus on two 47 V 50 silicone oil flows presenting Reynolds numbers over 1400 and considered nearly unsteady.…”

Section: Transition To Unsteadiness and Vortex Cavitationmentioning

confidence: 99%

Attached cavitation in laminar separations within a transition to unsteadiness

et al. 2019

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Attached sheet cavitation is usually observed in turbulent water flows within small laminar separation bubbles which can provide favorable conditions for inception and attachment of cavities. In the present study, viscous silicone oils are used within a small scale Venturi geometry to investigate attached cavitation into laminar separated flows for Reynolds numbers from 346 to 2188. Numerical simulations about single phase flows are performed with steady simulations for a Reynolds number range Re ∈ [50; 1400] and with unsteady simulations for Re ∈ [1000; 2000]. They reveal the emergence of two large laminar boundary layer separations downstream of the Venturi throat in addition to low pressure zones which can possibly induce both degassing or cavitation features. Experiments are performed with high-speed photography, and several multiphase dynamics are observed in these viscous flows, which are considered as quasisteady flows at low Reynolds numbers Re ≤ 1400. Degassing phenomenon with air bubble recirculation has been first observed at pressures far above liquid vapor pressure whereas typical attached cavities have been identified for low pressure conditions as "band" and "tadpole" cavities into the different separations of the laminar flows. For higher Reynolds numbers, a flow regime transition can be noticed in the wake of well-developed gas structures, characterized by wake instabilities, causing vortex cavitation above a critical Reynolds number associated with the bubble width Re b c ≃ 616. This regime transition can possibly occur either quasicontinuously in the wake of an attached "band" vapor cavity or intermittently behind a recirculating air bubble generated with degassing. This last phenomenon is associated in our study to classical "patch" cavitation.

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Shock wave emission during the collapse of cavitation bubbles

Cited by 30 publications

References 10 publications

Dynamic Characteristics of Bubble Collapse Near the Liquid-Liquid Interface

Dynamic Characteristics of Bubble Collapse Near the Liquid-Liquid Interface

Laser-plasma induced shock waves in micro shock tubes

Attached cavitation in laminar separations within a transition to unsteadiness

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