Characteristics of exploding metal wires in water with three discharge types

Abstract

This paper presents the characteristics of underwater electrical wire explosion (UEWE) with three discharge types, namely, Type-A, Type-B, and Type-C. Experiments were carried out with copper and tungsten wires (4 cm long and 50–300 μm in diameter) driven by a microsecond time-scale pulsed current source with 500 J stored energy. A time-integrated spectrometer and a photodiode were used to measure the optical emission of UEWE. A Polyvinylidene Fluoride probe was adopted to record the pressure waveforms. Experimental results indicate that from Type-A to Type-C, more energy deposits prior to the voltage peak and the first peak power increases drastically. This variation of energy deposition influences the optical emission and shock wave generation process. Specifically, the light intensity decreases by more than 90% and the peak of continuous spectra moves from ∼400 nm to ∼700 nm. In addition, the peak pressure of the first shock wave increases from ∼2 MPa to more than 7.5 MPa.

Multi frame synchrotron radiography of pulsed power driven underwater single wire explosions

“…Again, the energy deposited is far higher than the energy of ∼235 J required for the entire wire to melt, vaporise, and transfer it to a weakly-ionized plasma state. The long plateau was also observed in earlier research 19 and is likely due to a dwell in a mixed liquid-gas state because of its high density.…”

Dynamical aspects of nanoparticle formation by wire explosion process

“…The concentration of the vapour can be defined using mass density of the vapour (Den Vap_Expt ) experimentally as the ratio of the mass of wire and the volume of expansion of vapour, Vol Vap_Expt : Den Vap_Expt =M Wire /Vol Vap_Expt where, Vol Vap_Expt =4πR 3 /3 and R=0.5d Vap . As reported in previous literature (Kotov 2003, Shikoda et al 2009, Tokoi et al 2013, Han et al 2017 on WEP, the expansion of vapour depends on P and K. K plays the role of increasing the temperature as the heating of the wire in WEP is so fast and energy efficient that it gets converted completely to thermal energy if we neglect other losses of energy. Expansion of the vapour/plasma is volumetric (Tokoi et al 2013) and it increases as P decreases, so with ideal gas law, we can define the relationship of theoretical volume of vapour cloud, Vol Vap_Ther :…”

Evolution of the Pore and Fracture Microstructure Inside Coal Impacted by a High-Voltage Electric Pulse after AlCl3 Solution Treatment

“…In the 1930s, some scholars started to investigate the use of high-voltage electric pulses produced using capacitor discharge to generate X-rays. , In the 1950s, high-voltage pulse technology developed into a new research discipline. , First, the electric pulse technology was gradually developed in the field of national defense, and it was used in nuclear explosion simulation, nuclear radiation simulation, electromagnetic microwave, and so on. , In the 1970s, Germany, the former Soviet Union, and other countries attempted to solve the problems of formation plugging and pollution in oil exploitation using electric pulse technology, and they achieved good results. − In recent years, pulse technology has been used to clean fine dust, treat wastewater, and for internal shock wave gravel, broken rock or borehole, and oil well electric pulse plug removal . High-voltage pulse technology acts on the load through the electro-discharge effect .…”