by Nelson Alexandre Almeida
Abstract:
In this thesis, a numerical modelling is performed of non-equilibrium layers near cathodes and anodes of high-pressure arc discharges. In contrast to previous works, the modelling is unified, i.e., based on a single set of equations without simplifying assumptions such as thermal equilibrium, ionization (Saha) equilibrium, and quasi-neutrality, and does not employ an \textita priori division of the calculation domain into sub-layers with different physical properties. Transport of the ions and electrons is described in the framework of the diffusion model. A theory was also developed of the near-cathode ionization layer in the framework of the multifluid model. The obtained results are compared with experimental data. The results of this thesis elucidate the physics of current transfer through near-electrode layers in high-pressure arc discharges, and contibute to better understanding of phenomena occurring in various industrial devices, such as the very high-pressure discharge lamps and plasma torches.
Reference:
Nelson Alexandre Almeida, "Modelização das camadas junto aos eléctrodos em descargas de arco de alta pressão", PhD thesis, Universidade da Madeira, 2009.
Bibtex Entry:
@PHDTHESIS{Tese2009,
author = {Nelson Alexandre Almeida},
title = {Modelização das camadas junto aos eléctrodos em descargas de arco
de alta pressão},
school = {Universidade da Madeira},
year = {2009},
abstract = {In this thesis, a numerical modelling is performed of non-equilibrium
layers near cathodes and anodes of high-pressure arc discharges.
In contrast to previous works, the modelling is unified, i.e., based
on a single set of equations without simplifying assumptions such
as thermal equilibrium, ionization (Saha) equilibrium, and quasi-neutrality,
and does not employ an \textit{a priori} division of the calculation
domain into sub-layers with different physical properties. Transport
of the ions and electrons is described in the framework of the diffusion
model. A theory was also developed of the near-cathode ionization
layer in the framework of the multifluid model. The obtained results
are compared with experimental data. The results of this thesis elucidate
the physics of current transfer through near-electrode layers in
high-pressure arc discharges, and contibute to better understanding
of phenomena occurring in various industrial devices, such as the
very high-pressure discharge lamps and plasma torches.},
file = {Tese2009.pdf:Tese2009.pdf:PDF},
owner = {x},
slides = {Tese2009_slides.pdf},
timestamp = {2009.10.29}
}