Investigation of liquid metallic wire heating dynamics

Abstract

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.

Homogeneity in a Metal Wire under Melting

“…We chose the parameters ρ 0 = 19.224 g·cm −3 , T 0 = 293 K for the solid phase and ρ 0 = 17.2 g·cm −3 , T 0 = 3685 K for the liquid phase in accordance with equation-of-state reference points at atmospheric pressure, σ 0 = 20.6 µ −1 · m −1 , β = 6.5 kK −1 , and δ = 1.76 for solid tungsten according to experimental data [1,10] and σ 0 = 0.7 µ −1 · m −1 , β = 0.02 kK −1 , and δ = 0.67 for liquid tungsten from data analysis [11]. The electrical conductivity of the two-phase state in the melting region is determined by…”

“…(8)- (11), another test was developed. For the case of a slightly nonuniform distribution of parameters over the wire, we can write as in Ref.…”

“…As one can see from Eqs. (3) and (5), the velocity and thickness of the melting wave depend on the thermodynamic parameters of the substance as well as the heating power; therefore, in the simulations we used equation of state [9] and electrical conductivity [10,11] models that adequately describe the thermophysical properties of the substance.…”

Analysis of Isobaric Expansion Data Based on Soft-Sphere Equation of State for Liquid Metals

“…Two variants of EOS have been constructed (VI and V2). The first variant VI is in agreement with the measurements of density versus temperature [6] and the second one V2 is in agreement with data [9]. In both cases the results of EOS calculations correspond well to the experimental information on enthalpy, evaporation temperature under the normal pressure T^ = 5953 K [18], sound velocity and vapor pressure (see Fig.…”

“…There are four sets of isobaric expansion measurements on tungsten: in water at P = I bar [6] and 1 kbar [7] and in the inert gas atmosphere at P = 2…”