Modeling of shock-wave generation in water by electrical discharges

Madhavan, S.; Doiphode, P.; Chaturvedi, S.

doi:10.1109/27.901232

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…Dynamic motion of ions could result in potential instabilities and shock waves as have been observed experimentally. [38][39][40][41] Having discussed the role of the electric field on the polarizability and dipole orientation in pure water, simulation results that include Na + and Cl − ions are presented next. Three ion pairs were used for a 18 Å cubical simulation box.…”

Section: Resultsmentioning

confidence: 99%

“…Such shock waves have indeed been observed in high-voltage, water-filled systems. [38][39][40][41] In this contribution, we analyze the electrical double layer at the electrode-water interface for high-voltage devices close to the breakdown point, based on a Monte Carlo approach. This allows for the inclusion of field-dependent permittivity, and provides a self-consistent spatial distribution of the dipole structure, orientation, ionic concentrations and potentials.…”

Section: (Ii)mentioning

confidence: 99%

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Microscopic analysis for water stressed by high electric fields in the prebreakdown regime

Joshi

Qian

Schoenbach

et al. 2004

Journal of Applied Physics

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Analysis of the electrical double layer at the electrode-water interface for voltages close to the breakdown point has been carried out based on a static, Monte Carlo approach. It is shown that strong dipole realignment, ion-ion correlation, and finite-size effects can greatly modify the electric fields and local permittivity (hence, leading to optical structure) at the electrode interface. Dramatic enhancements of Schottky injection, providing a source for electronic controlled breakdown, are possible. It is also shown that large pressures associated with the Maxwell stress tensor would be created at the electrode boundaries. Our results depend on the ionic density, and are in keeping with recent observations. A simple, perturbative analysis shows that high field regions with a sharp variation in permittivity can potentially be critical spots for instability initiation. This suggests that the use of polished electrodes, or composite materials, or alternative nonpolar liquids might help enhance high-voltage operation.

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Section: Resultsmentioning

confidence: 99%

Section: (Ii)mentioning

confidence: 99%

Microscopic analysis for water stressed by high electric fields in the prebreakdown regime

Joshi

Qian

Schoenbach

et al. 2004

Journal of Applied Physics

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“…Moreover, the PAED are associated with the emission of a powerful shock wave propagating radially into the water. The pressure waves generated have peak values in the range of 1 bar to 10 kbar [14,15]. The bandwidth of the acoustic wave is wide, with frequencies of up to 10 MHz.…”

Section: Introductionmentioning

confidence: 99%

Development of subsonic electrical discharges in water and measurements of the associated pressure waves

Touya¹,

Reess²,

Pécastaing³

et al. 2006

J. Phys. D: Appl. Phys.

127

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This paper first presents an experimental electrical and optical study of the development of an electrical discharge in water. The point–plane water gap is subjected to a 0.02 µs/350 µs impulse voltage. A Schlieren device associated with an image converter or a photomultiplier demonstrates that the discharge phenomenon requires heating of the water located around the extremity of the point. This thermal process leads to the formation of gas bubbles in which an electrical discharge propagates. In the experimental conditions a threshold value of 80 J is necessary to create bubbles. No UV or IR light emission is recorded before the presence of bubbles is detected. When the energy conditions are sufficient (⩾200 J), the volume of bubbles grows until the whole inter-electrode space is filled; then a breakdown of the gap occurs. When this happens, a high amplitude pressure shock wave is generated. In the second phase of this work the shock wave created by the gap breakdown was studied for energy levels up to 100 kJ. It is clearly pointed out that the pressure shock wave peak value depends on the energy remaining at breakdown time. For a constant remaining energy, the peak pressure value increases with increasing gap length.

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“…UPSS technology can be used to realize narrow-pulse ultrawideband (UWB) sonar detection system, which breaks through the limitations of traditional sonar signal carrier modulation technology [1,2]. It has the advantages of high emission sound source level (up to 260 dB), wide frequency bandwidth (bandwidth between tens of hertz and hundreds of kilohertz), high electroacoustic conversion efficiency, high distance resolution, strong penetration ability, and strong anti-interference ability [1][2][3][4][5]. At present, this technology has been widely used in civil fields such as extracorporeal shock wave lithotripsy, water treatment, oil pipeline blockage removal, rock fragmentation, and marine resources exploration.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Sound Source Position Error on Distribution Characteristics of Underwater Shock Wave Bunching Sound Field

Liu

et al. 2021

Mathematical Problems in Engineering

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Curved reflection bunching technique of underwater plasma sound source (UPSS) uses the geometric characteristics of the curved reflector to reflect and bunching intense sound shock wave, so the center position error of the sound source is one of the important factors affecting the bunching performance of the shock wave. In this paper, the cause of the sound source position error is analyzed in detail, and nonlinear finite element software ANSYS/LS-DYNA (dynamic analysis software developed by LSTC) is used to establish the model of the shock wave bunching sound field. Through numerical simulations, the shock wave bunching sound field distribution characteristics under the influence of different position errors are comprehensively simulated, and the bunching performance of the shock wave and its influence law are deeply analyzed according to the simulation results. It provides guidance for reasonably controlling the machining error and installation error of the reflector and discharge electrode, estimating the effective discharge times of the discharge electrode, and formulating the design process.

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Modeling of shock-wave generation in water by electrical discharges

Cited by 13 publications

References 3 publications

Microscopic analysis for water stressed by high electric fields in the prebreakdown regime

Microscopic analysis for water stressed by high electric fields in the prebreakdown regime

Development of subsonic electrical discharges in water and measurements of the associated pressure waves

Effect of the Sound Source Position Error on Distribution Characteristics of Underwater Shock Wave Bunching Sound Field

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