München 2019 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 4: Atmospheric Pressure Plasmas I
P 4.6: Vortrag
Montag, 18. März 2019, 15:30–15:45, HS 20
On the plasma bullet shape of He and He/O2 capillary plasma jet devices and interaction with dielectric surface — •Constantinos Lazarou1,2, Charalambos Anastassiou2, Ionut Topala3, Alina Chiper3, Ilarion Mihaila4, Valentin Pohoata3, and George Georghiou1,2 — 1FOSS, University of Cyprus, Nicosia, Cyprus — 2ENAL, University of Cyprus, Nicosia, Cyprus — 3IPARC, Alexandru Ioan Cuza University of Iasi, Iasi, Romania — 4CERNESIM, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
In this study, a two-dimensional axi-symmetric model has been used to study the evolution of capillary helium plasma jets with and without oxygen admixtures and their interaction with a dielectric surface placed normal to the jet axis. The model considers the gas mixing of helium and ambient air and the analytical chemistry between helium, nitrogen and oxygen species.
In particular, this work examines, from first principles, the shape and speed of the of the plasma bullet, the intensity of the induced electric (IEF) field on a dielectric surface and the underlying dominant chemical reactions of the plasma. Furthermore, this work provides insight and understanding into the mechanisms behind many experimental observations such as the torus (or donut) and sphere plasma bullet shapes for pure Helium and He/O2 plasma, respectively.