The main purpose of the present work consists in the study of supply frequency and sodium vapor pressure effects on the sodium lamp properties. The retained model is a two-temperature channel type that reproduces quite well the electrical and thermal behaviors as well as the main radiative characteristics of mercury-sodium discharge plasma and can be easily coupled with the lamp circuitry software.
In this paper, a second-order continuum model for radio-frequency glow discharge plasma between parallel-plate electrodes is presented. Simulations have been performed for discharges in argon and O 2 . The basic data needed for different collision processes are explicitly given with a high degree of accuracy. These data are rigorously calculated by using a multiterm Boltzmann equation solution for electrons and a Monte Carlo simulation technique for ions. The specificity of the present work is the use of a second-order fluid model solved by using a powerful finite-element scheme associated with basic data rigorously calculated. Detailed results for two types of discharge are presented and contrasted. The phenomena associated with the transition of the discharge into different operating regimes at relatively low and high pressures are demonstrated and discussed.
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