Speaker
I. U. Uzun-Kaymak
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.3017.pdf
A Development of Atmospheric Pressure Dielectric Barrier-Discharge
System Using Computational Tools
B. Turkyilmaz1, E. Ipek1, D. Ozdemir1, E.I. Sungur1, I.U. Uzun-Kaymak1
1 Middle East Technical University Department of Physics, Ankara, Turkey
The Dielectric Barrier Discharge (DBD) plasma systems have a wide range of applicability
such as surface sterilization, surface property improvement, ozone generation1. In this
study the main focus is to simulate and to design an atmospheric DBD system for the
purpose of bifurcation studies. Previously, we have shown period doubling bifurcations in
dc driven semiconductor-gas discharges2. The DBD system consists of two copper ring
electrodes placed concentrically around a quartz tube of 4mm inner diameter and 6mm
outer diameter. The quartz tube is preferred due to its dielectric characteristics and high
melting point. When the Argon gas is fed to the quartz tube at an atmospheric pressure, the
plasma is obtained by applying modulated high voltage to one of the electrodes while other
one is grounded. Expected uniform microdischarges produce a well defined dielectric
discharge behaviour. Applying a high frequency AC high voltage generally reignites the old
microdischarge channels at every half period1. In order to take advantage of this memory
effect, a high voltage high frequency square wave is applied. Spatial and temporal plasma
properties are investigated for both 1-D and 3-D models of the system using COMSOL
Multiphysics. In agreement with simulations, width and separation of electrodes are
determined. It is observed that an order of 10 kV AC high voltage oscillating near 10kHz
frequency is at least required effectively to generate the plasma. For plasma generation, a
high voltage DC source is modulated using optocouplers and IGBT based H-bridges and
transformers. Also, a matching network is designed to optimize the delivered power.
Designs of circuits are done using NI Multisim simulations. The current and voltage
characteristic of assembled circuits are evaluated with respect to values in simulations.
1. U. Kogelschatz, B. Eliasson, W. Egli .Journal de Physique IV Colloque. 07, (1997).
2. D. Mansuroglu, I. U. Uzun-Kaymak, I. Rafatov, Phys. of Plasmas, 24, 053503 (2017).
