The knowledge of transport coefficients is of interest in the modelling of flow in plasma processes and heat transfer. Calculations are performed in the temperature range of 9000-20 000 K and for different pressures (1, 3, 6 and 10 bar). The composition of e/C/H/N/O mixture plasmas is determined at equilibrium and four examples are studied: H 2 O, CO 2 , CO-H 2 O and CH 4 -air plasmas. First, the most recent data of potential interactions or elastic differential cross sections are carefully examined in order to choose the most appropriate ones to determine the collision integrals. Second, in this study devoted to high temperature calculations, we have restricted the species number to 12 (only atoms and atomic ions). Then we have tested the validity of our calculated composition and deduced that our transport properties are available for the temperature range of 9000-20 000 K at p = 1 bar and 11 000-20 000 K at p = 10 bar. Finally, the electrical conductivity, the viscosity and the total thermal conductivity are calculated for the four compositions and different pressures.
In this paper, calculated values of the viscosity and thermal conductivity of atomic nitrogen, taking into account three species (the ground and two excited states), are presented. The calculations, which assume that the temperature dependent probability of occupation of the states is given by the Boltzmann factor, are performed for atmospheric-pressure in the temperature range from 1,000 to 20,000 K. Six collision integrals are used in calculating the transport coefficients and we have introduced new averaged collision integrals where the weight associated at each interacting species pair is the probable collision frequency. The influence of the collision integral values and energy transfer between two different species is studied. These results are compared which those of published theoretical studies.
In this paper, the calculated values of the viscosity and thermal conductivity of nitrogen plasma are presented taking into account five (e, N, N + , N 2 and N 2 + ) or eight (e, N( 4 S), N( 2 P), N( 2 D), N(R), N + , N 2 and N 2 + ) species. The calculations are based on the supposition that the temperature dependent probability of occupation of the states is given by the Boltzmann factor. The domain for which the calculations are performed, is for p = 1 and 10 atm in the temperature range from 5,000 K to 15,000 K. Classical collision integrals are used in calculating the transport coefficients and we have introduced new averaged collision integrals where the weight associated at each interacting species pair is the probable collision frequency. The influence of the collision integral values and energy transfer between two different species is studied. These results are compared which those of published theoretical studies.
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