Electric characteristic and cavitation bubble dynamics using underwater pulsed discharge

Shan, Minglei; Chen, Bingyan; Yao, Cheng; Han, Qingbang; Zhu, Chengzhang; Yu, Yang

doi:10.1088/2058-6272/ab0b62

Cited by 18 publications

(12 citation statements)

References 35 publications

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“…The shock wave generated by an HVEP will reflect and refract in water, and the incident wave and reflected wave will form a subatmospheric pressure area. When the cavitation pressure of water is reached, a cavitation effect will occur. , During the propagation of the shockwave from the electric pulse, a high temperature and high pressure can be generated at the moment of cavitation collapse. At the same time, there are a large number of cavitation cores in the coal seam.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Study of the Structural Damage to Coal Treated by a High-Voltage Electric Pulse Discharge in Water

Nie

Zhang

et al. 2022

Energy Fuels

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High-voltage electric pulse (HVEP) technology has been gradually adopted as an effective method in the drainage and utilization of coalbed methane (CBM) in low-permeability coal reservoirs. An experimental device was established to study the structural variation characteristics of bituminous coal samples treated by an HVEP. The structure parameters of coal samples before and after the HVEP treatment were measured using a scanning electron microscope and low-temperature nitrogen adsorption. Additionally, the current waveforms in the process of HVEP discharge were analyzed by a digital oscilloscope. The results showed that the pressure of the shockwave produced by an HVEP increased with an increase in discharge energy, which intensifies the damage effect on the coal body. Some newly generated pores and cracks appeared in the bituminous coal samples after the HVEP treatment. As the discharge energy increased, the number of pores and fractures increased, and the diameters of the pores and the widths of the fractures also gradually increased. The average pore diameter, specific surface area, and most probable pore diameter of bituminous coal samples treated by an HVEP were greater than those of the untreated coal. Furthermore, after the HVEP treatment, the fractal dimension D 1 was larger than that of raw coal, while the fractal dimension D 2 was smaller than that of raw coal. This indicates that although the pore structure in coal became more complex after an HVEP, the surfaces of the pores became smoother. These changes were unfavorable to the adsorption of gas in the coal but conducive to the diffusion and flow of gas. The combined action of the shockwave cracking effect, the cavitation vibration effect, and the effect of thermal expansion promoted the expansion and connection of micro-and macropores and fractures in the coal, improving the permeability of coal seams. The research results demonstrate that the HVEP technology can significantly alter the structural characteristics of coal deposits in a way favorable for the development of CBM.

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Section: Resultsmentioning

confidence: 99%

“…When the cavitation pressure of water is reached, a cavitation effect will occur. 68,69 During the propagation of the shockwave from the electric pulse, a high temperature and high pressure can be generated at the moment of cavitation collapse. At the same time, there are a large number of cavitation cores in the coal seam.…”

Section: Ln 2 -A Results and Analysismentioning

confidence: 99%

Experimental Study of the Structural Damage to Coal Treated by a High-Voltage Electric Pulse Discharge in Water

Nie

Zhang

et al. 2022

Energy Fuels

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“…Figure 5 shows the comparison between the current bubble profile and the results of an underwater pulsed discharge experiments published in the literature (Shan et al, 2019). Due to the difference in the size of the cavitation bubbles in the experimental study and numerical simulation, their collapse time cannot be directly compared and needs to be normalized.…”

Section: Bubble Profile and Grid Independent Validationmentioning

confidence: 99%

Numerical Investigations on Temperature Distribution and Evolution of Cavitation Bubble Collapsed Near Solid Wall

Shan

Kan

et al. 2022

Front. Energy Res.

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The internal temperature distribution and evolution in cavitation bubble can be investigated numerically by a thermal lattice Boltzmann method. The simulation results are consistent with the calculational results of the Rayleigh-Plesset equation and the temperature equation when the cavitation bubble collapses in an infinite liquid medium and satisfy Laplace’s law. In this work, a cavitation bubble collapsing near a solid wall is explored to investigate the characteristics and effects of the bubble temperature. The progress of the bubble temperature can be clearly captured from a two-dimensional temperature field. The results show that the bubble temperature can reach extremely high values during both its first and its second collapse. The change of the bubble temperature is highly related to the jet velocity and the liquid pressure. Furthermore, the effects on the bubble temperature of the offset parameters, the initial driving pressure and the initial bubble radius are also studied. The present findings are meaningful for the research of thermodynamics of cavitation.

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“…While previous works have analysed the phenomena of cavitation influenced by an external electric field, these works employed different techniques for the generation of cavitation such as underwater pulse discharge, 26 and ultrasound induced cavitation. 27 The technique of electric-field assisted laser ablation in liquids (EFLAL) has recently gained prominence for the synthesis of nanoparticles of a variety of morphologies.…”

Section: Introductionmentioning

confidence: 99%

An empirical experimental investigation on the effect of an external electric field on the behaviour of laser-induced cavitation bubbles

Phukan

Kharphanbuh

Nath

2023

Phys. Chem. Chem. Phys.

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Electric characteristic and cavitation bubble dynamics using underwater pulsed discharge

Cited by 18 publications

References 35 publications

Experimental Study of the Structural Damage to Coal Treated by a High-Voltage Electric Pulse Discharge in Water

Experimental Study of the Structural Damage to Coal Treated by a High-Voltage Electric Pulse Discharge in Water

Numerical Investigations on Temperature Distribution and Evolution of Cavitation Bubble Collapsed Near Solid Wall

An empirical experimental investigation on the effect of an external electric field on the behaviour of laser-induced cavitation bubbles

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