Study of the Electrical Characteristics, Shock-Wave Pressure Characteristics, and Attenuation Law Based on Pulse Discharge in Water

Dong, Yan; Bian, Decun; Zhao, Jinchang; Niu, Shaoqing

doi:10.1155/2016/6412309

Cited by 20 publications

(24 citation statements)

References 9 publications

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“…Figure 8 shows typical discharge current and voltage curves of liquid pulsed discharge experiments, consisting of two processes (pre-breakdown and breakdown). According to previous studies [25,26,55], the pre-breakdown process during the beginning few microseconds reveals that the discharge voltage descends gradually from the values of charging voltage while the discharge Figure 8 shows typical discharge current and voltage curves of liquid pulsed discharge experiments, consisting of two processes (pre-breakdown and breakdown). According to previous studies [25,26,55], the pre-breakdown process during the beginning few microseconds reveals that the discharge voltage descends gradually from the values of charging voltage while the discharge current oscillates at a low value.…”

Section: Resultsmentioning

confidence: 64%

“…Liquid pulsed discharge refers to the phenomenon that the liquid medium between two electrodes breaks down because of the pulsed discharge, leading to the formation of strong plasma tunnel at high temperature and inner pressure. The generated atoms and ions burst into medium with a strong shockwave and cavitation bubble collapse subsequently [25,26]. Liquid pulsed discharge is utilized for degradation of organic [27,28], cell sterilization [29] in water and other applications [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Few-Layer Graphene by Pulsed Discharge in Graphite Micro-Flake Suspension

et al. 2019

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Few-layer graphene nanosheets were produced by pulsed discharge in graphite micro-flake suspension at room temperature. In this study, the discharging current and voltage data were recorded for the analysis of the pulsed discharge processes. The as-prepared samples were recovered and characterized by various techniques, such as TEM, SEM, Raman, XRD, XPS, FT-IR, etc. The presence of few-layer graphene (3–9 L) in micrometer scale was confirmed. In addition, it is investigated that the size of recovered graphene nanosheets are influenced by the initial size of utilized graphite micro-flake powder. Based on the process of pulsed discharge and our experimental results, the formation mechanism of few-layer graphene was discussed. The influence of charging voltage on as-prepared samples is also investigated.

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Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Preparation of Few-Layer Graphene by Pulsed Discharge in Graphite Micro-Flake Suspension

et al. 2019

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“…The experiments focused on normal reflection of the shock wave, so the characteristics of the pulse discharge are not discussed here [18]. However, we were careful to ensure all charging voltages corresponding to one group of complete experiments were highly consistent, including the current waveforms.…”

Section: Measurement Of High Voltagementioning

confidence: 99%

Normal Reflection Characteristics of One-Dimensional Unsteady Flow Shock Waves on Rigid Walls from Pulse Discharge in Water

Dong

Zhao

Niu

2017

Shock and Vibration

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Strong shock waves can be generated by pulse discharge in water, and the characteristics due to the shock wave normal reflection from rigid walls have important significance to many fields, such as industrial production and defense construction. This paper investigates the effects of hydrostatic pressures and perturbation of wave source (i.e., charging voltage) on normal reflection of one-dimensional unsteady flow shock waves. Basic properties of the incidence and reflection waves were analyzed theoretically and experimentally to identify the reflection mechanisms and hence the influencing factors and characteristics. The results indicated that increased perturbation (i.e., charging voltage) leads to increased peak pressure and velocity of the reflected shock wave, whereas increased hydrostatic pressure obviously inhibited superposition of the reflection waves close to the rigid wall. The perturbation of wave source influence on the reflected wave was much lower than that on the incident wave, while the hydrostatic pressure obviously affected both incident and reflection waves. The reflection wave from the rigid wall in water exhibited the characteristics of a weak shock wave, and with increased hydrostatic pressure, these weak shock wave characteristics became more obvious.

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“…The work [9] is devoted to the investigation of the electrical and hydrodynamic characteristics of the discharge in water at an elevated hydrodynamic pressure (up to 8 MPa). Here, the discharge of a capacitive storage device of60 μF, charged to (8-13) kV, was studied.…”

mentioning

confidence: 99%

“…, (8) where В, с are the empirical constants that depend on the composition of the gas inside the bubble (for example, for water vapor at Е/р = 120 -800 (V•m)/N constants B = 290, c = 0.3 -0.6); p 0 is the normal atmospheric pressure, p 0 ≈ 10 5 Pa; h = r 2 /r 1 ; d cr is the critical (minimal) size of the bubble at which its breakdown occurs determined according to (9): The calculation according to formula (8) assumes the following assumptions:…”

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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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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Study of the Electrical Characteristics, Shock-Wave Pressure Characteristics, and Attenuation Law Based on Pulse Discharge in Water

Cited by 20 publications

References 9 publications

Preparation of Few-Layer Graphene by Pulsed Discharge in Graphite Micro-Flake Suspension

Preparation of Few-Layer Graphene by Pulsed Discharge in Graphite Micro-Flake Suspension

Normal Reflection Characteristics of One-Dimensional Unsteady Flow Shock Waves on Rigid Walls from Pulse Discharge in Water

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

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