Thermodynamic and Transport Properties of N₂/O₂ Mixtures at Different Admixture Ratios

Abstract

Thermodynamic and transport properties such as mass density, enthalpy, specific heat, electrical and thermal conductivities and radiation power of N2/02 mixture plasmas at different admixture ratios were calculated in pressure range from 0.1 to 2 MPa on the assumption of thermal equilibrium condition. The first order approximation of Chapman-Enskog method was adopted to derive the transport properties. The thermodynamic and the transport properties thus derived were used to predict the temperature distributions and electric field strength of wall-stabilized N2/02 arcs in steady state at a current of 20 Ad, in order to investigate fundamental feature of N2/02 mixture arcs before current zero. The calculation revealed that the temperature at the center of the arcs had a local minimum value of 8800 K at an admixture ratio around 80% N2-20% O2 and whilst the conductance of the arc has a minimum at an admixture ratio of 100% N2 for pressure of 0.5 MPa in steady state.

Thermodynamic and transport properties of CO2, CO2–O2, and CO2–H2 mixtures at temperatures of 300 to 30,000 K and pressures of 0.1 to 10 MPa

“…From the standpoint of prevention of global warming, more environment-friendly arc quenching media are needed for circuit breakers, and studies of SF 6 alternatives are in progress. For example, N 2 [1], air [2], CO 2 [2][3][4][5][6], and other non-fluorinecontaining high-pressure gases are being considered. In particular, CO 2 has started to attract attention as an arc quenching medium, and full-scale 72-kV prototype circuit breakers using CO 2 have been manufactured [8].…”

Thermal Treatment of Granulated Particles by Induction Thermal Plasma

“…Thermodynamic and transport properties of argon and oxygen gases required for the simulation are mass density, specific heat at constant pressure, viscosity, electrical and thermal conductivity and radiative loss coefficient. The transport properties, which are function of temperature, are calculated under LTE conditions using Chapman-Enskog first approximation to Boltzmann equation [Tanaka, 2000]. The effective diffusion coefficient of species is calculated based on the following equations:…”

Gas-Flow Simulation With Contact Moving in GCB Considering High-Pressure and High-Temperature Transport Properties of SF<tex>$_6$</tex>Gas

“…The outline of calculation methods is as follows. Details can be referred to in the literature [10], [11].…”