Affiliation:
1. Physics Department, Technion, Haifa 3200003, Israel
2. Engineering Mechanics Department, Royal Institute of Technology, Stockholm 114 28, Sweden
Abstract
Experimental and magnetohydrodynamic numerical simulation results and analysis of a μs- and sub- μs-timescale overdamped underwater electrical explosion of copper wires having different lengths and diameters are presented. For these explosions, ∼80% of the energy stored in the pulse generator is deposited into the wire during a time comparable or shorter than a quarter period of the underdamped discharge. It was found that the threshold values of the deposited energy density, energy density rate, and energy density per unit area, which satisfy overdamped discharge, depend on the wire parameters and on the timescale of the explosion. It was shown that the mechanism responsible for this is the process during which the wire experiences phase transitions to a low-ionized plasma, the resistivity of which is determined by the electron–neutral collision rate, which, in turn, depends on the wire radial expansion velocity, current density, and temperature.
Funder
Israel Science Foundation
Wenner-Gren Foundation
Cited by
6 articles.
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