Abstract
Early stage of underwater electrical wire explosion was observed by shadowgraph. By decreasing initial energy, the early stage of wire explosion was slowed down and possible to capture shadow photos during phase transitions. The vaporization process of wire is usually axially non-uniform due to random local micro explosions along the wire. The degree of non-uniform will be significantly decreased when increasing the initial energy. During explosion of the wire, more than one shock waves were generated not only from phase transition, but also from different pulses of deposition power. A modified piston model was introduced to explain the phenomenon.
Highlights
The shock wave (SW) generated by underwater electrical wire explosion (UEWE) have increasingly attracted attention due to a growing number of applications, such as increasing the production and enhancing the recovery in oil wells [1], target ignition for the inertial confinement fusion [2], electrohydraulic forming [3], non-thermal food processing [4] and warm dense matter [5].When pulsed high current flow through a metallic wire immersed in water, the wire experiences fast Joule heating and a series of phase transitions [6]
A modified piston model was introduced to explain the phenomenon. It revealed that power deposited into wire continuously struggled with pressure from surrounding water
The deposition energy was calculated to be 34.5 J using the formula below where uR, i and uW were resistive voltage, measured current and measured voltage; LW was the wire inductance obtained by calculation
Summary
When pulsed high current flow through a metallic wire immersed in water, the wire experiences fast Joule heating and a series of phase transitions [6]. The mechanism for the generation of SW is usually attributed to the rapid volume expansion during phase transitions. Some phase transitions happen concurrently with pulse discharge. They were defined as ‘‘early stage’’ of UEWE in this paper. Much effort had been made to investigate the shock waves generated by UEWE. Two wave fronts around the exploding wire were usually observed on the photo, they were identified with the melting SW and vaporization SW. Shadowgraph and Schlieren photography were used to observe the exploding wire and the shock wave. By comparing the experimental interferograms with the calculated interferograms, the parameters of the highly compressed water were obtained and fed into numerical
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