Addressing the problem of uniform converging spherical shock wave in water

Nitishinskiy, M.; Efimov, S.; Yanuka, D.; Gurovich, V. Tz.; Krasik, Ya. E.

doi:10.1063/1.4964286

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…So far our experimental attempts for the observation of sonoluminescence in our specific cylindrical configuration and liquid confinement of bubble implosion has been unsuccessful. At the moment, the present work of converging shock-driven bubble creation and implosion opens novel perspectives and challenges in the frame of high amplitude shock waves in liquids and energetic cavitation [17,18,[30][31][32][33].…”

Section: Discussionmentioning

confidence: 99%

Single-bubble and multibubble cavitation in water triggered by laser-driven focusing shock waves

et al. 2018

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In this study a single laser pulse spatially shaped into a ring is focused into a thin water layer, creating an annular cavitation bubble and cylindrical shock waves: an outer shock that diverges away from the excitation laser ring and an inner shock that focuses towards the center. A few nanoseconds after the converging shock reaches the focus and diverges away from the center, a single bubble nucleates at the center. The inner diverging shock then reaches the surface of the annular laser-induced bubble and reflects at the boundary, initiating nucleation of a tertiary bubble cloud. In the present experiments, we have performed time-resolved imaging of shock propagation and bubble wall motion. Our experimental observations of single-bubble cavitation and collapse and appearance of ring-shaped bubble clouds are consistent with our numerical simulations that solve a one-dimensional Euler equation in cylindrical coordinates. The numerical results agree qualitatively with the experimental observations of the appearance and growth of large bubble clouds at the smallest laser excitation rings. Our technique of shock-driven bubble cavitation opens interesting perspectives for the investigation of shock-induced single-bubble or multibubble cavitation phenomena in thin liquids.

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Section: Discussionmentioning

confidence: 99%

Single-bubble and multibubble cavitation in water triggered by laser-driven focusing shock waves

et al. 2018

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“…Based on twodimensional (2D) hydrodynamic simulations, Kozlov et al compared the effect of shock front instability with different wavelengths on the energy cumulation process and the pressure in the vicinity of implosion axis, pointing out corrugation effect and convergence effect jointly determine the growth of perturbations [6]. Nitishinskiy et al estimated the pressure behind the incident converging shock front near the implosion origin of spherical wire array using the time-resolved optical emission spectrum of capillary plasma, and the result agreed well with 1D hydrodynamic model, which indirectly proved the uniformity of the converging shock waves [7]. Yanuka et al observed the uniformity of cylindrical converging shock waves at a very small radius using laser backlit framing images.…”

Section: Introductionmentioning

confidence: 88%

Unbalanced distribution of electric current in underwater electrical wire array explosion

Liu¹,

Diao²,

Xu³

et al. 2022

J. Phys. D: Appl. Phys.

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The uniformity of electric current distribution in a wire array and its unstable behavior during the process of underwater electrical explosion have been investigated. Two exploding wires in parallel were used in the experiments and the current waveforms flowing through each wire were obtained using two self-integrating coils. Significant differences in the current waveforms of the two wires were observed near the melting point, which was attributed to the non-simultaneity of heating and phase transition. Unbalanced current distribution caused by the deviations of wire dimensions was analyzed based on a magneto-hydrodynamic model, and the simulation results show that thermodynamic state difference between two wires is present throughout the entire electrical explosion process. It is also found that the initial stored energy of pulse generator will affect the thermodynamic state evolution of exploding wires, resulting in different behaviors of current distribution after the explosion time. The slightly different heating rate caused by unbalanced current distribution in a wire array can break the symmetry of converging shock waves and lower the pressure peak in the vicinity of implosion axis, which was discussed based on the two-dimensional hydrodynamic simulations.

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Mechanism of the formation of the structure and phase state of binary metallic nanoparticles obtained by the electric explosion of two wires made of different metals

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2017

Current Applied Physics

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Addressing the problem of uniform converging spherical shock wave in water

Cited by 3 publications

References 11 publications

Single-bubble and multibubble cavitation in water triggered by laser-driven focusing shock waves

Single-bubble and multibubble cavitation in water triggered by laser-driven focusing shock waves

Unbalanced distribution of electric current in underwater electrical wire array explosion

Mechanism of the formation of the structure and phase state of binary metallic nanoparticles obtained by the electric explosion of two wires made of different metals

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