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Rare gas flow structuration in plasma jet experiments

Robert, Éric and Sarron, Vanessa and Darny, Thibault and Riès, Delphine and Dozias, Sébastien and Fontane, Jérôme and Joly, Laurent and Pouvesle, Jean-Michel Rare gas flow structuration in plasma jet experiments. (2014) Plasma Sources Science and Technology, vol. 23 (n° 1). ISSN 0963-0252

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Official URL: http://dx.doi.org/10.1088/0963-0252/23/1/012003

Abstract

Modifications of rare gas flow by plasma generated with a plasma gun (PG) are evidenced through simultaneous time-resolved ICCD imaging and schlieren visualization. The geometrical features of the capillary inside which plasma propagates before in-air expansion, the pulse repetition rate and the presence of a metallic target are playing a key role on the rare gas flow at the outlet of the capillary when the plasma is switched on. In addition to the previously reported upstream offset of the laminar to turbulent transition, we document the reverse action leading to the generation of long plumes at moderate gas flow rates together with the channeling of helium flow under various discharge conditions. For higher gas flow rates, in the l min−1 range, time-resolved diagnostics performed during the first tens of ms after the PG is turned on, evidence that the plasma plume does not start expanding in a laminar neutral gas flow. Instead, plasma ignition leads to a gradual laminar-like flow build-up inside which the plasma plume is generated. The impact of such phenomena for gas delivery on targets mimicking biological samples is emphasized, as well as their consequences on the production and diagnostics of reactive species.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Université d'Orléans (FRANCE)
Laboratory name:
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Deposited By: Jérôme Fontane
Deposited On:03 Mar 2014 15:15

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