Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Numerical analysis of plasma properties in the glow discharge: accuracy and applicability of simple and extended fluid models
Download
index.pdf
Date
2017
Author
Kaymazlar, Koray
Metadata
Show full item record
Item Usage Stats
264
views
111
downloads
Cite This
The work deals with numerical investigation of physical processes in the gas discharge plasma. Numerical models are based on the fluid description of plasma, with drift-diffusion approximation for charged particle fluxes. First, we developed a “simple” fluid model, consisted of continuity equations for electrons and ions, coupled to Poisson equation for electric field. Next, we extended this model by incorporating the electron Boltzmann equation module, such that the electron transport parameters (mobility and diffusion) as well as the rates of electron induced plasma-chemical reactions are determined as functions of the local electric field, from convolution of the electron energy distribution function. The numerical method is based on the Method of Lines, where discretization in the coordinate space (as well as in the energy space for Boltzmann equation) is done by the Scharfetter-Gummel scheme. All numerical codes are developed using MATLAB package. Computational tests are carried out for glow discharge plasma in argon. Comparison of computed plasma parameters (such as the electron and ion densities, the electric field and potential, the current-voltage curves) obtained by “simple” and “extended” fluid models with one another and with experimental data allow to determine the accuracy and the ranges of applicability of these models.
Subject Keywords
Glow discharges.
,
Plasma dynamics.
,
Numerical analysis.
,
Mathematical models.
URI
http://etd.lib.metu.edu.tr/upload/12620811/index.pdf
https://hdl.handle.net/11511/26351
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Thermal and mechanical properties of some fcc transition metals
Cagin, T; Dereli, G; Uludogan, M; Tomak, Mehmet (1999-02-01)
The temperature dependence of thermodynamic and mechanical properties of six fee transition metals (Ni, Cu, Ag, Au, Pt, Rh) are studied using molecular dynamics (MD) simulations. The structures are described at elevated temperatures by the force fields developed by Sutton and co-workers within the context of the tight binding approach. In these simulations the thermodynamic and mechanical properties are calculated in the temperature range between 0 to 1500 K using the statistical fluctuation expressions ove...
Numerical investigation of a dc glow discharge in an argon gas: two-component plasma model
Kemaneci, Efe Hasan; Rafatov, İsmail; Department of Physics (2009)
This thesis deals with a one and two dimensional numerical modeling of a low-pressure DC glow discharge in argon gas. We develop two-component fluid model which uses the diffusion-drift theory for the gas discharge plasma and consists of continuity equations for electrons and ions, as well as Poisson equation for electric field. Numerical method is based on the control volume technique. Calculations are carried out in MATLAB environment. Computed results are compared with the classic theory of glow discharg...
Numerical analysis of formation of hexagonal and band structures in the gas discharge - semiconductor system
Rafatov, İsmail (2015-09-01)
The spontaneous formation of regular hexagonal and band structures in the current distribution of the gas discharge – semiconductor system is studied. The system consists of a planar glow discharge layer with short length in the forward direction and wide lateral dimensions, which is coupled to a planar semiconductor layer with low conductivity. The whole structure is sandwiched between two plane electrodes to which a dc voltage is applied. The choice of input parameters is guided by the experimental study ...
Observed nonlinearities in a DC semiconductor-gas discharge system
ÇAYLI, YAVUZ KERİM; MANSUROĞLU, DOĞAN; Uzun Kaymak, İlker Ümit (Canadian Science Publishing, 2018-07-01)
Nonlinear behaviour of a direct current (DC) driven semiconductor-gas discharge plasma is investigated experimentally. The setup consists of two planar electrodes separated by a gap of 1 mm. Plasma glow is generated between a semiconductor cathode and a transparent anode using nitrogen gas at partial atmospheric pressure. Nonlinear behavior of the discharge is investigated by varying the applied DC voltage while monitoring the plasma current (I), voltage (V), and the optical emission, (i.e., amplified volta...
Calculation of the Dielectric Constant of a Ferroelectric Liquid Crystal From a Mean Field Model
YURTSEVEN, HASAN HAMİT; Yurtseven, Hasan Hamit (2011-01-01)
The static dielectric constant epsilon(perpendicular to) of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'--heptyloxybiphenyl (A7) with high spontaneous polarization is calculated as a function of temperature using a mean field model. This calculation is performed close to the smectic A-isotropic liquid (SmA-I) transition for pure optically active compound (T-c = 81.6 degrees C). For this calculation of epsilon(perpendicular to), the free energy of the SmA phase is expanded in terms of...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
K. Kaymazlar, “Numerical analysis of plasma properties in the glow discharge: accuracy and applicability of simple and extended fluid models,” M.S. - Master of Science, Middle East Technical University, 2017.