On the accuracy and reliability of different fluid models of the direct current glow discharge

Rafatov, İsmail
We developed and tested 2D "extended fluid model" of a dc glow discharge using COMSOL MULTIPHYSICS software and implemented two different approaches. First, assembling the model from COMSOL's general form pde's and, second, using COMSOL's built-in Plasma Module. The discharge models are based on the fluid description of ions and excited neutral species and use drift-diffusion approximation for the particle fluxes. The electron transport as well as the rates of electron-induced plasma-chemical reactions are calculated using the Boltzmann equation for the EEDF and corresponding collision cross-sections. The self-consistent electric field is calculated from the Poisson equation. Basic discharge plasma properties such as current-voltage characteristics and electron and ion spatial density distributions as well as electron temperature and electric field profiles were studied. While the solutions obtained by two different COMSOL models are essentially identical, the discrepancy between COMSOL and CFD-ACE+ model solutions is about several percents and caused by the difference in the models due to undocumented details in the software packages. We also studied spatial distributions of particle fluxes in discharge plasma and identified the existence of vortex component of the discharge current. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3688875]


ONAL, I; YALCIN, N; UYGUN, E; OZTURK, H (1990-01-01)
A computer model was developed to simulate the performace of three commercial reactors in series for dehydrogenation of ethylbenzene to styrene. The model can be used to predict the performance of dehydrogenation catalysts in the commercial reactors. In the model program, flow of the reactant stream through the catalyst bed is treated as one-dimensional plug flow. The kinetic rate parameters were obtained by using the Conjugate Direction method as a multivariable search technique so as to minimize the su...
Two-dimensional hybrid Monte Carlo-fluid modelling of dc glow discharges: Comparison with fluid models, reliability, and accuracy
EYLENCEOGLU, E.; Rafatov, İsmail; KUDRYAVTSEV, A. A. (2015-01-01)
Two-dimensional hybrid Monte Carlo-fluid numerical code is developed and applied to model the dc glow discharge. The model is based on the separation of electrons into two parts: the low energetic (slow) and high energetic (fast) electron groups. Ions and slow electrons are described within the fluid model using the drift-diffusion approximation for particle fluxes. Fast electrons, represented by suitable number of super particles emitted from the cathode, are responsible for ionization processes in the dis...
Account of nonlocal ionization by fast electrons in the fluid models of a direct current glow discharge
Rafatov, İsmail; KUDRYAVTSEV, A. A. (AIP Publishing, 2012-09-01)
We developed and tested a simple hybrid model for a glow discharge, which incorporates nonlocal ionization by fast electrons into the "simple" and "extended" fluid frameworks. Calculations have been performed for an argon gas. Comparison with the experimental data as well as with the hybrid (particle) and fluid modelling results demonstated good applicability of the proposed model. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4752419]
Two-Dimensional Numerical Analysis of Phosphorus Diffused Emitters on Black Silicon Surfaces
TÜRKAY, Deniz; Yerci, Selçuk (2018-07-06)
In this work, we present an analysis on electrical performance of phosphorus diffused emitters on black silicon surfaces through two-dimensional simulations. In particular, we focus on the extraction and analysis of the emitter saturation current density (J(0e)), the sheet resistance (R-sh), spatial collection efficiency profile and relatedly J(sc) of a solar cell. Using process simulations, we form emitters on periodic triangular structures with various aspect ratios (R) and emitter profiles. We show that ...
Kuşoğlu Sarıkaya, Cemre; Rafatov, İsmail; Çakır, Serhat (2016-3-01)
We developed 1d3v Particle in Cell/Monte Carlo Collision (PIC/MCC) numerical code for the RF (radio-frequency) capacitive glow discharge. This method includes the solution of the Lorentz force equation for the motion of super particles and the Poisson equation for the electric field. Collisions between the particles are modeled with the Monte Carlo method. In this process, the isotropic and charge exchange collisions between the ion-neutral pairs, as well as the elastic, excitation and ionization collisions...
Citation Formats
İ. Rafatov and A. A. KUDRYAVTSEV, “On the accuracy and reliability of different fluid models of the direct current glow discharge,” PHYSICS OF PLASMAS, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36070.