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Exploding electrical wires underwater to understand shock waves

Date:
May 2, 2019
Source:
American Institute of Physics
Summary:
Shock wave studies allow researchers to achieve the warm dense matter that's found only in the extreme conditions around stars and created in the laboratory for inertial confinement fusion research, and researchers recently set out to understand the relation, if any, between the evolution of a shock wave and the expansion of the exploding wire.
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If you're not a plasma physicist, exploding electrical wires underwater may sound like a bad idea. But it's actually a way to study shock waves, the propagating disturbances that move faster than the speed of sound.

Shock wave studies allow researchers to achieve the warm dense matter that's found only in the extreme conditions around stars and created in the laboratory for inertial confinement fusion research. Shock waves also have medicinal, industrial and military applications. Exploding an electrical wire underwater is one way to generate a shock wave and give scientists a tool to verify the equations used to predict shock waves.

Researchers from the Technion Israel Institute of Technology set out to understand the relation, if any, between the evolution of a shock wave and the expansion of the exploding wire in a recent paper in the journal Physics of Plasmas, from AIP Publishing. Taking shadow streak images to see the trajectory of the shock waves, they found that the wire's expansion determines how a shock wave decays, and developed a simplified model to describe this relationship.

The researchers observed that long after the shock wave is generated, the wire continues to expand, which leads to a significantly slower shock wave than predicted by previous models. Further unlike previous models, this new model does not assume self-similar motion and instantaneous energy release.

"Surprisingly, and this is the exciting part, the results of this simplified model fit excellently the experimentally obtained results," said Alexander Rososhek, an author of the paper. The experiment showed that the exploding wire that generates the shock wave expands with subsonic velocity.

"This finding, together with one-dimensional hydrodynamic simulations, allowed us to understand in depth the transient process governing shock wave generation," said Rososhek, "and advances our knowledge of shock wave generation as a whole."

More specifically, these results apply to different experimental setups to study shock waves. For example, the results of this research can be used in experiments where shock intensity is amplified by a water flow acquiring additional energy by combustion of the exploded wires.

In future research, Rososhek and the other paper authors will attempt to increase shock wave intensity by altering properties of the exploding wire, which could provide a supplementary energy deposition. They would also like to employ a high-intensity picosecond-timescale X-ray beam to study the initial phase of shock generation through joint work led by Simon Bland's group from the Imperial College of London with the European Synchrotron Radiation Facility.


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Materials provided by American Institute of Physics. Note: Content may be edited for style and length.


Journal Reference:

  1. A. Rososhek, S. Efimov, V. Gurovich, A. Virozub, S. V. Tewari, Ya. E. Krasik. Evolution of a shock wave generated by underwater electrical explosion of a single wire. Physics of Plasmas, 2019; 26 (4): 042302 DOI: 10.1063/1.5092321

Cite This Page:

American Institute of Physics. "Exploding electrical wires underwater to understand shock waves." ScienceDaily. ScienceDaily, 2 May 2019. <www.sciencedaily.com/releases/2019/05/190502104843.htm>.
American Institute of Physics. (2019, May 2). Exploding electrical wires underwater to understand shock waves. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2019/05/190502104843.htm
American Institute of Physics. "Exploding electrical wires underwater to understand shock waves." ScienceDaily. www.sciencedaily.com/releases/2019/05/190502104843.htm (accessed March 28, 2024).

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