The dynamics of a microsecond electric explosion of a tungsten wire in water is studied. A theoretical search for conditions of liquid wire radial uniformity is given. A new optical methods of temperature and radius measurements has been worked out. Mathematical modelling has been carried out to confirm the existence of radial uniformity and to compare the results with experimental and theoretical data. Conditions for the radial uniformity existence of liquid wire heating are presented; as tungsten uniform heating takes place at , one can use these regimes for investigation of the properties of liquid matter. The temperature dependence of liquid tungsten conductivity is given and compared with literature values. It is shown that vaporization begins with surface layers at chosen regimes of electric wire explosion.
This study deals with the nucleation mechanism of electric explosion of wires allowing estimation of wire parameters at the start of the explosion for a wide range of experimental conditions. We analyse the dependence of the limit value of the energy deposited during the initial resistive phase of heating of the wire on the parameters of the wire and circuit as well as the size distribution of metal particles formed on electrical explosion of the wire. We discuss the correspondence of these results with previously published experimental data.
The structure of the discharge channel during nanosecond wire explosions has been studied using laser probing. Wires of 25μm diameter and 12mm length were exploded in air and vacuum by 10kA current pulse having a 50A∕ns rate of rise. Upon electrical explosion of thin wires in the air, the development of shock waves was observed. The propagation of shock waves was analyzed, and it was possible to draw conclusions on the location of the flow of most of the current in the volume of the discharge channel. This permitted distinguishing between two scenarios (shunting and internal) of the interelectrode gap breakdown development. The scenario depends to a large extent on the properties of the exploding wire material. The same two scenarios are valid upon electrical explosion of wire in vacuum. Moreover, if secondary breakdown develops in the internal scenario, the value of the energy deposition in the wire material during explosion in vacuum may be comparable with that found during explosion in air.
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