| Περίληψη: | The aim of the present thesis is to study the fluid dynamic and the thermal effects
of an Dielectric Barrier Discharge (DBD) plasma reactor which is used in order
to decontaminate sewage sludge. It is an engineer’s duty to study technologies that
are environmentally friendly, since such technologies can save not only Earth’s life, but
also humans’ life. The decontamination of sewage sludge is such a technology due to the
fact that the sludges in our country are unusable, which is a large waste, since we can
exploit them in agricultural purposes. This thesis deals with the numerical analysis of
the mentioned reactor, and the aims are to study the fluid dynamic characteristics of the
flow and the thermal effects. First of all, we present the theory behind plasma and the
way that cold plasma contribute to the treatment of contaminated soil and sewage
sludge. Afterwards, a description of the DBD plasma reactor follows, i.e the apparatus
that is used for the plasma generation and the decontamination of the sewage sludge. A
significant part of the thesis, deals with the mesh generation. The geometry of the
reactor is relatively complex, so a lot of tests were necessary for an appropriate mesh to
be achieved. An appropriate mesh, is a mesh dense enough to converge to the correct
solution, but without an excessive computational cost, at the same time. The next large
part of the thesis has to do with the fluid dynamic and the thermal analysis of the
problem. A new solver, based on OpenFOAM’s standard solvers, had to be developed for
the purpose of solving the specific problem. The final section of the present thesis,
considers the comparison of the numerical results with the experimental data.
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