Publication detail

Modeling of argon-steam thermal plasma flow for abatement of fluorinated compounds

JENIŠTA, J. CHAU, S. CHIEN, S. ŽIVNÝ, O. TAKANA, H. NISHIYAMA, H. BARTLOVÁ, M. AUBRECHT, V. MURPHY, A.

Original Title

Modeling of argon-steam thermal plasma flow for abatement of fluorinated compounds

Type

journal article in Web of Science

Language

English

Original Abstract

This study presents a numerical model of the hybrid-stabilized argon-steam thermal DC plasma torch of a new design for generating an argon-steam plasma suitable for efficient abatement of persistent perfluorinated compounds. The model includes the discharge region and the plasma jet flowing to the surrounding steam atmosphere contained in a plasma-chemical chamber. Compared to previous studies, the torch had a smaller nozzle diameter (5.3 mm) and a reduced input power (20-40 kW) and arc current (120-220 A). The outlet region for the plasma jet extends to 20 cm downstream of the exit nozzle. Fluid dynamic and thermal characteristics together with diffusion of argon, hydrogen and oxygen species, and distribution of plasma species in the discharge and the plasma jet are obtained for currents from 120 to 220 A. The results of the calculations show that the plasma jet exhibits high spatiotemporal fluctuations in the shear layer between the plasma jet and colder steam atmosphere. The most abundant species in the plasma jet are hydrogen and oxygen atoms near the jet center, and molecules of H-2, O-2 and OH in colder surrounding regions. Satisfactory agreement is obtained with measurements of the radial temperature and electron number density profiles near the jet center close to the nozzle exit.

Keywords

hybrid-stabilized electric arc; combined diffusion coefficients; inhomogeneous mixing; mole fraction; plasma species

Authors

JENIŠTA, J.; CHAU, S.; CHIEN, S.; ŽIVNÝ, O.; TAKANA, H.; NISHIYAMA, H.; BARTLOVÁ, M.; AUBRECHT, V.; MURPHY, A.

Released

4. 7. 2022

Publisher

IOP Publishing Ltd

Location

BRISTOL

ISBN

0022-3727

Periodical

Journal of Physics D: Applied Physics

Year of study

55

Number

37

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

20

Pages count

20

URL

https://iopscience.iop.org/article/10.1088/1361-6463/ac7aee

BibTex

@article{BUT178844,
  author="Jiří {Jeništa} and Shiu-Wu {Chau} and Sheng-Wei {Chien} and Oldřich {Živný} and H. {Takana} and H. {Nishiyama} and Milada {Bartlová} and Vladimír {Aubrecht} and A. B. {Murphy}",
  title="Modeling of argon-steam thermal plasma flow for abatement of fluorinated compounds",
  journal="Journal of Physics D: Applied Physics",
  year="2022",
  volume="55",
  number="37",
  pages="1--20",
  doi="10.1088/1361-6463/ac7aee",
  issn="0022-3727",
  url="https://iopscience.iop.org/article/10.1088/1361-6463/ac7aee"
}