Metastable Fluid Decay During Electric Explosion of Metallic Foils

Oreshkin, V. I.; Zhigalin, A. S.; Rousskikh, A. G.; Chaikovsky, S. A.; Baksht, R. B.

doi:10.1007/s11182-017-1228-y

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…Therefore, a WE in vacuum is in some sense an incomplete, interrupted explosion. In this case, the value of the dimensionless factor A in (3) is slightly lower than that for an explosion in a medium, but still remains of the order of unity [83]. The breakdown time depends on the time derivative of the current density: the greater the d j/dt, the further the phase trajectory of the metal moves toward the critical point (see Fig.…”

Section: A Specific Current Action Integralmentioning

confidence: 86%

“…1) will occur in a WE is related to the rate of decay of the metastable states. Experimental studies of the explosion of metal foils [27], [83] showed that when the energy deposited in the foil metal was about half the sublimation energy, the time of decay of the superheated liquid was about 100 ns. However, this time should decrease with an increase in energy input [76].…”

Section: Features Of the Mhd Simulation Of The Explosion Of Wires In ...mentioning

confidence: 99%

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Wire Explosion in Vacuum

Oreshkin

Baksht

2020

IEEE Trans. Plasma Sci.

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This article presents a review of experimental and theoretical studies devoted to the processes that occur during explosions of wires in vacuum when the current densities in the wire are of the order of 10 8 A/cm 2 and the current density rise rates are no less than 10 15 A/(cm 2 • s). The theoretical background is focused on the transformation of the wire metal into ionized plasma. In particular, the basic physical notions used to describe wire explosions (WEs; state diagram, current action integral, and metal conductivity changes in phase transitions) are given; magnetohydrodynamic equations are described which are used to simulate WEs, and the simulation predictions are discussed together with their reliability. Extensive experimental data on WEs in vacuum are presented which made it possible to describe the corona and core formation and the development of electrothermal instabilities in the core. The data on the energy deposited in a wire exploding in vacuum reported by different authors are compared. In conclusion, problems are discussed that require additional experimental investigations, namely, the role of metastable states in a WE and the mechanism by which the core is shunted.

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Section: A Specific Current Action Integralmentioning

confidence: 86%

Section: Features Of the Mhd Simulation Of The Explosion Of Wires In ...mentioning

confidence: 99%

Wire Explosion in Vacuum

Oreshkin

Baksht

2020

IEEE Trans. Plasma Sci.

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Modeling of the initial stages of the formation of heterogeneous plasma flows in the electric explosion of conductors

Sarychev

Невский

Konovalov

et al. 2018

Current Applied Physics

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Foil explosion and decay of metastable state

et al. 2019

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The mechanism of decay of the superheated metastable metal produced by a thin foil explosion was investigated experimentally. The decay of the metastable metal was indicated by the occurrence of bubbles detected using soft x-ray backlighting. The experiments were carried out on a research facility comprising three current generators. One of them was used to initiate the explosion of a test foil, and the other two, X-pinch backlighting sources, were used for diagnostics. In the experiments, an upper limit has been determined for the decay time of the metastable state of a superheated metal. For aluminum, at a foil thickness of 6 μm and a deposited energy of 1.49 ± 0.08 eV/atom, the metastable state decay time was about 90 ns; for copper, at the same foil thickness and a deposited energy of 1.46 ± 0.07 eV/atom, it was about 250 ns. Analysis of the experimental results based on the classical nucleation theory has made it possible to estimate the work required for the formation of a critical bubble, the radius of the critical bubble, and the Tolman length, which characterizes the effect of the surface curvature on the surface tension. The work required for the formation of a critical bubble has been estimated to be 16.6 ± 1.5 eV for aluminum and 18.3 ± 1.2 eV for copper. The critical bubble radius and the Tolman length turned out to be several nanometers for both test metals.

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Metastable Fluid Decay During Electric Explosion of Metallic Foils

Cited by 6 publications

References 27 publications

Wire Explosion in Vacuum

Wire Explosion in Vacuum

Modeling of the initial stages of the formation of heterogeneous plasma flows in the electric explosion of conductors

Foil explosion and decay of metastable state

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