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Início Arquivos Representantes Futuras reuniões American Society of Thermal and Fluids Engineering

ISSN On-line: 2379-1748

ISBN Imprimir: 978-1-56700-431-1 (Flash Drive)

ISBN On-line: 978-1-56700-430-4

First Thermal and Fluids Engineering Summer Conference
August, 9-12, 2015 , New York City, USA

CARACTERISTICS OF RADIO FREQUENCY CAPACITIVELY COUPLED DISCHARGE OPERATING ON WATER-VAPOUR AND IN HELIUM-WATER MIXRURES

Get access pages 733-736
DOI: 10.1615/TFESC1.eep.012555

Resumo

A one-dimensional fluid model of capacitively coupled discharge driven by radio frequency source at low and atmospheric has been investigated. The simulation has been performed using the Comsol multiphysics platform. The results show that pure water-vapour discharge can be generated by using rf source just at low pressure. However, at atmospheric pressure and room temperature, stable plasma can be created when adding a small fraction 5% of water vapor to 95% of Helium. The process for suppressing plasma ignition in the first case can be attributed to the high rate of electrons cooling. Vibrational and rotational excited states reactions are the main dominant reactions at low energy in electron impact with water molecules. We have tested two ways in order to overcome these obstacles. The first one is by operating on a mixture of small fraction water with another main feed such as helium or Ar. The second one is by using a nanosecond pulsed generator as a driving source. Input parameters for plasma ignition have been identified in both cases. Plasma density profiles have been represented and the production of some important species such as OH, H and UV radiations has been also discussed.
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