Bulletin of the American Physical Society
61st Annual Gaseous Electronics Conference
Volume 53, Number 10
Monday–Friday, October 13–17, 2008; Dallas, Texas
Session ET1: Dielectric Barrier Discharges and Displays |
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Chair: O. Sakai, Kyoto University, Japan Room: Salon E |
Tuesday, October 14, 2008 4:00PM - 4:15PM |
ET1.00001: Homogeneous DBD in N2: II. Simulation in 0D and 1D approaches Sergey Pancheshnyi, Dzimtry Tsyganov, Pierre Segur In this paper we develop and validate a zero- and one-dimensional three-temperature plasmachemical model of a uniform DBD discharge in pure nitrogen at atmospheric pressure. The complete kinetic model includes 17 species (electrons, ions, neutrals) and 41 processes including excitation and ionization by electron impact, associative ionization, ion-electron recombination, and heavy species conversion. In the 0D model the electron density and the electric field are calculated using measured gap voltage and discharge current density that allows direct verification of the kinetic scheme. Using a comparison between the simulated and measured densities of N atoms, the importance of the surface dissociative electron-ion recombination process is shown. A simple analytical expression for the atom production, which provides a highly accurate description of the complete model, is presented. The role of surface processes for electric behavior of the discharge is analyzed using a self-consistent model. This 1D model is based on balance equations for charged species in the electric field which is described by Poisson's equation. [Preview Abstract] |
Tuesday, October 14, 2008 4:15PM - 4:30PM |
ET1.00002: Nanosecond pulsed surface dielectric discharge development Maryia Nudnova, Andrei Starikovskii Subsequent images of surface nanosecond barrier discharge development were obtained with nanosecond time resolution. The velocities of discharge propagation were obtained, discharge uniformity and filling ratio of the gap by plasma has been investigated. SDBD modeling was performed in a hydrodynamic approximation for 3-dimensional geometry. To initialize the streamers formations near the edge of the high-voltage electrode the sinusoidal perturbation in the initial electron concentration was applied. The calculations of streamer propagation for such condition are discussed. The development of initial perturbation in X-Z plane is clearly seen. Developed streamers are not sensitive to initial pre-ionization. Also calculations with relatively small value of initial ionization n$_{e}$(0) = 10$^{3}$ cm$^{-3}$ were carried out. Such initial concentration corresponds to single discharge propagation. The discharge propagation was calculated up to time $\tau $ = 2 ns. The mean velocity of the streamer was about 5 mm/nm, and typical size of single streamer was about 0.3 mm in good agreement with the experiment. [Preview Abstract] |
Tuesday, October 14, 2008 4:30PM - 4:45PM |
ET1.00003: The gas conversion of methane with oxygen at atmospheric pressure using a cylindrical dielectric barrier discharge Tom Martens, Dragana Petrovic, Christophe De Bie, Annemie Bogaerts, Wouter Brok, Jan van Dijk The conversion of methane to useful chemicals and liquid fuels currently requires steam reforming, which requires great amounts of energy input. We are currently investigating the possibilities of using a plasma activated system for this gas conversion. Due to the pulsed nature and the low operating temperature capabilities, we have chosen the atmospheric pressure dielectric barrier discharge as a setup to investigate whether it can be used as a more efficient gas conversion reactor. For this purpose we have developed a CH$_{4}$/O$_{2}$ chemical reaction set and used it in a 2D fluid model of a cylindrical dielectric barrier discharge, in which we also incorporate the influence of the gas flow. In this way we investigate whether we can optimize the production of methanol or formaldehyde. The parameters under study are the CH$_{4}$/O$_{2}$ ratio, the applied voltage characteristics, the gap width and the gas flow rate. [Preview Abstract] |
Tuesday, October 14, 2008 4:45PM - 5:00PM |
ET1.00004: Pulsed plasma-enhanced chemical vapor deposition (P-PECVD) of silicon based materials with a low-frequency dielectric barrier discharge (DBD) Christopher J. Oldham, Matthew R. King, C. Richard Guarnieri, Jerome J. Cuomo This work studied a P-PECVD process for the deposition of silicon based materials. In the process, the RF power is applied in specific ``on'' and ``off'' cycles. The process is operated in a DBD configuration at atmospheric pressure. In this pressure range, vapor phase growth typically dominates conventional processes, rather than the desired film growth. Our work has found by using the P-PECVD process, gas phase growth was eliminated and adhesion to the substrate was achieved. A growth process similar to atomic layer deposition (ALD) and conventional PECVD processing will be discussed. [Preview Abstract] |
Tuesday, October 14, 2008 5:00PM - 5:15PM |
ET1.00005: Development of a new plasma reactor for propene removal Linda Oukacine, Jean-Michel Tatibou\"et The purpose of the study is to develop a new plasma reactor being applied to gas phase pollution abatement, involving a surface dielectric barrier discharge (SDBD) at atmospheric pressure. Propene was chosen as a model pollutant. The system can associate a SDBD with a volume dielectric barrier discharge (VDBD). A specific catalyst can be placed in post-plasma site in order to destroy the residual ozone after use it as a strong oxidant for total oxidation of propene and by-products formed by the plasma reactor. A comparative study has been established between the propene removal efficiency of these two plasma geometries. The results demonstrate that SDBD is a promising system for gas cleaning. The experiments show that ozone production depends on plasma system configuration and indicate the effectiveness of combining SDBD and VDBD. The NOx formation remains very low, whereas ozone formation is the highest for the SDBD. The influence of some materials on the propene removal and the ozone production were studied. [Preview Abstract] |
Tuesday, October 14, 2008 5:15PM - 5:30PM |
ET1.00006: Using Sensitivity Derivatives for Design and Computing Error Bounds in an Atmospheric Plasma Discharge Simulation Kyle Lange, W. Kyle Anderson The problem of applying sensitivity analysis to a one-dimensional atmospheric radio frequency plasma discharge simulation is considered. The derivations of forward mode direct differentiation and the reverse mode adjoint method are presented. Sensitivity derivatives computed from these methods are then shown to match derivatives computed using finite differences. It is then demonstrated how sensitivity derivatives can be used within a design cycle to change experimentally variable quantities so as to increase or decrease a given cost function. It is also shown how sensitivity derivatives of rate and transport parameters can be used to compute error bounds for the computation of a given cost function. Finally, it is described how sensitivity analysis could be used in conjunction with experimental data to obtain better estimates for rate and transport parameters. [Preview Abstract] |
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