Thermodynamic properties calculation of C_alphaH_betaO_gammaN_thetainsulator plasmas

Abstract

In the temperature range 5000-30000 K, thermodynamic properties of plasmas from vaporization of Calpha Hbeta Ogamma Ntheta insulators have been calculated in the pressure range from 1*105 Pa to 10*105 Pa. The method of calculation is indicated. The analysis shows that the respective proportions of carbon, hydrogen, oxygen and nitrogen atoms ( alpha , beta , gamma and theta ) in the organic molecule can notably modify the characteristics of the medium (plasma).

Composition and thermodynamic properties of ablated vapours of PMMA, PA6-6, PETP, POM and PE

“…The variations in composition with temperature of materials widely used in industry, namely PMMA, PA6-6, PETP, PE and POM vapours, have been calculated. These results complete those obtained in the temperature range 5000-30 000 K [2,[4][5][6][7].…”

“…Figures 6 and 7 show respectively the specific Gibbs free energy and specific enthalpy of the five plasmas formed in the insulator vapours studied. These results are in agreement within ±3% with other authors [2,4,6,7] in the temperature range of 5000-10 000 K. From the figures we can see that the variation of the Gibbs free energy is constant with temperature (figure 6) unlike the specific enthalpy (figure 7).…”

“…The chemical equilibrium for the five plasmas formed in insulator vapours are shown in figures 1 to 5 in the temperature range 1000 K to 10 000 K. The results are in good agreement with other authors [2,[5][6][7] in the temperature range 5000-10 000 K, although these authors do not take the same chemical species into account, especially the polyatomic species.…”

“…For a better understanding of the interaction between the insulator wall and the arc, we need to know the composition and thermodynamic properties of the plasma formed in insulator vapours at low temperature. Many calculations resolving mass action laws [2,[5][6][7] and others using the Gibbs free energy minimization method [3,4] have already been made in the temperature range 5000-30 000 K. To complete these studies, we determine the composition below 5000 K. Previous experiments near the insulator wall during the interaction have shown that the temperature is low (< 8000 K) [8].…”

The influence of graphite on the composition and thermodynamic properties of plasma formed in ablated vapour of PMMA, PA6-6, PETP, POM and PE used in circuit-breakers

“…When the solid phase of carbon has not yet been formed the results are identical in the two cases. The concentrations between temperatures of 5000 and 10 000 K were given in our previous paper [15] and for temperatures higher than 10 000 K they have been given in various papers: PMMA in [1,6], PA6-6 in [1,5,6,11], PETP in [1,6], POM in [1,6] and PE in [1,4].…”