Effect of trapping of resonance radiation in a free-burning Ar arc

Influence of Resonance Radiation Transport on Chemical Equilibrium in an Argon Arc

“…3). Analysis has been done for the case with homogeneous absorption coefficient (k =1), since the spatial dependency of the absorption coefficient has much lower impact on the results in comparison with transport effects [4]. Determination of the density was performed for regions separated from electrodes by a distance of 1 mm in order to exclude the processes in the cathode and the anode layers where the application of the model is restricted.…”

“…The expression under the integral describes the probability of the photon travel between the points r and r without being absorbed. The matrix solution approach [4] consists of discretization of the integral equation ( 3) by dividing the entire plasma volume into a number of small cells (n) in accordance with the chosen geometry. The discretization procedure is similar to that described in detail in the previous work [4].…”

“…The matrix solution approach [4] consists of discretization of the integral equation ( 3) by dividing the entire plasma volume into a number of small cells (n) in accordance with the chosen geometry. The discretization procedure is similar to that described in detail in the previous work [4]. In addition the axial dependency was taken into account by consideration…”

“…Therefore, the models [1][2][3] use effective lifetime approximation in order to take into account the corresponding radiation trapping. In the work [4], which used the input data from model [2], a matrix method for description of resonance radiation transport was proposed. Transport of resonance radiation is a notable process, which influences the formation of various spatially-temporal structures in the gasdischarge plasma.…”

“…In the present contribution the results obtained by collisional-radiative model with extended kinetic scheme are presented. As an extension of approach [4], the radiation transport accounts for all resonance states of argon atom, also several additional highlyexcited levels have been taken into account. Furthermore, the model includes both the axial and radial dependency for the conditions typical for tungsten inert gas welding (TIG).…”