48 research outputs found
Ozone generation by wire-to-cylinder corona reactor with N2+O2 mixture
The UV-visible spectroscopyin the range from190 to 320 nm wasutilizedtodetectthe ozone formation, in wire-to-cylindercorona reactorwithnegativepolarity. The effectof N2+O2 mixture on ozone production has been investigated. The maximum production of ozone was already corresponding to 70% of oxygen in the gas mixture forany applied voltage from 4,5 to 7 K
Ozone generation in a wire-to-cylinder corona discharge ozonizer fed with mixtures of O2 and N2
The generation of ozone in a coaxial wire-cylinder corona discharge reactor has been experimentally investigated using variable proportions (5% to 90%) of oxygen in nitrogen. The experiments have been carried out under negative polarity and using different gas flow rates (50 cm3/min to 200 cm3/min). The obtained results show that the corona current exhibits a certain dependence with the percentage of oxygen in the gas mixture, which may influence the rate of ozone production. Moreover, the evaluation of the ozone yield has revealed a non-linear dependence of this magnitude with the concentration of oxygen. The maximum ozone yield was obtained when the percentage of oxygen in the gas mixture was about 70%
Ozone generation using negative corona discharge: numerical simulation and comparison with experiments
SHEATH CHARACTERISTICS OF AN EXCIPLEX XE-NE-HCL LAMP PUMPED BY PHOTO TRIGGERED DISCHARGE
Two-dimensional modeling of the electrical breakdown in rare gases
In this work a two-dimensional numerical study of dielectric barrier discharge has been proposed in order to understand the breakdown process in rare gases. We used a fluid model which is based on the numerical solution of the two Boltzmann equations (continuity and momentum); these equations are coupled to the Poisson鈥檚 equation. This model allowed us to plot the Paschen curve, which represents the breakdown voltage as a function of pressure-distance product. The aim of the study is to optimize the applied voltage and to understand how the discharge geometry and other physical parameters such as the secondary emission coefficient affected the breakdown voltage
Electrical and chemical properties of the
The purpose of this paper is to study, through numerical
modeling, the \chem{XeCl} kinetics and the mechanisms affecting
plasma uniformity in high-pressure discharge pumped excimer
lasers. In the model, the plasma is represented by a resistance
inversely proportional to the electron density. Time variation of
the electron density is obtained by integrating the transport
equations coupled to the heavy-species kinetics and to the
external circuit. A detailed description of the \chem{XeCl}
molecule and of the associated kinetics has been taken into
account, together with the effect of the gas mixture composition
on power deposition and the spatial uniformity of the plasma.
Calculated discharge current and voltage are compared with
experimental results. The obtained results indicate clearly that
about 50% of the halogen is consumed at the end of the discharge
pulse