A COMSOL modeling of the pre-breakdown heating phase in the electro-thermal breakdown of conductive water

Wang, Yibo; Liao, Dan; Zhang, Wen; Sun, Haiyang

doi:10.2991/icmemtc-16.2016.141

Proceedings of the 2016 3rd International Conference on Materials Engineering, Manufacturing Technology and Control 2016

DOI: 10.2991/icmemtc-16.2016.141

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A COMSOL modeling of the pre-breakdown heating phase in the electro-thermal breakdown of conductive water

Yibo Wang¹,

Dan Liao²,

Wen Zhang³

et al.

Abstract: Abstract. By using the multi-physics simulation software COMSOL, the pre-breakdown-heating phase in the electro-thermal breakdown of conductive water is modeled. In this COMSOL model, the Joule-heating module (jh) and the electric circuit module (cir) are used together to simulate the time-evolution of the temperature in the central axis of the underwater gap.

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2018

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“…Calculation of the dynamics of the formation of a gas bubble in water and its heating under the influence of the voltage applied to the electrodes by the electrothermal model at electric field strength up to 10 kV/cm is given in [5]. The use of a multiphysical calculation model in the COMSOL program showed that a discharge in water with a conductivity of 3 S/m of a 5 mF storage capacitance charged to a voltage of 3 kV leads to an increase in the temperature in the interelectrode gap to (300-800) K and the transition of water to a vapor state.…”

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Analysis and Development of the Bubble Model of the Formation Stage of High-Voltage Breakdown of the Water Gap

Zhekul¹,

Khvoshchan²,

Smirnov³

et al. 2018

Elektroteh. elektromeh.

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Purpose. A high-voltage underwater electric explosion, realized by discharging a capacitor into a water gap, is characterized by three main stages: the stage of formation of the plasma channel, the channel stage and post-discharge one. Substantially, the channel, post-discharge stages and the efficiency of energy release in the channel and the increase in the hydrodynamic effect on the object being processed depend on the parameters of the stage of formation. The purpose of the work was to review the existing mechanisms for the formation of a high-voltage discharge channel with the analysis and development of a bubble model of the stage of formation of water gap breakdown. Methodology. We have applied the analysis of existing theories on the formation of a high-voltage discharge channel, the carrying out of electrophysical studies with the processing of the obtained data. Results. A review and analysis of modern concepts of pre-breakdown processes in a high-voltage electric discharge in a liquid showed that the «bubble» model of the ignition of a discharge is applicable at an electric field strength (36-180) kV/cm. We have further developed the bubble model of the stage of formation of high-voltage breakdown on the results of experimental studies of the electrical characteristics of the discharge in the aqueous electrolyte with increased hydrostatic pressure and minimum voltage providing ignition of the discharge. A qualitative description of three phases of the stage of formation of the plasma channel in the liquid electrolyte is proposed. Originality. We have further developed the bubble model of the stage of formation of highvoltage breakdown of the liquid electrolyte on the results of experimental studies of the electrical characteristics of the discharge in the aqueous electrolyte with increased hydrostatic pressure and minimum voltage providing ignition of the discharge. A qualitative variation of the resistance of the gap in the pre-breakdown stage of the discharge is considered. Practical value. Determination of the scientific basis for creating a methodology for calculating the pre-breakdown characteristics of an electric discharge to improve the efficiency of electric discharge devices. References 19, figures 4.

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mentioning

confidence: 99%

Analysis and Development of the Bubble Model of the Formation Stage of High-Voltage Breakdown of the Water Gap

Zhekul¹,

Khvoshchan²,

Smirnov³

et al. 2018

Elektroteh. elektromeh.

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A COMSOL modeling of the pre-breakdown heating phase in the electro-thermal breakdown of conductive water

Cited by 1 publication

References 5 publications

Analysis and Development of the Bubble Model of the Formation Stage of High-Voltage Breakdown of the Water Gap

Analysis and Development of the Bubble Model of the Formation Stage of High-Voltage Breakdown of the Water Gap

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