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Plasma action on helium flow in cold atmospheric pressure plasma jet experiments

Darny, Thibault and Pouvesle, Jean-Michel and Fontane, Jérôme and Joly, Laurent and Dozias, Sébastien and Robert, Éric Plasma action on helium flow in cold atmospheric pressure plasma jet experiments. (2017) Plasma Sources Science and Technology, vol. 26 (n° 10). pp. 105001-105012. ISSN 0963-0252

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Official URL: https://doi.org/10.1088/1361-6595/aa8877

Abstract

In this work, helium flow modifications, visualized by schlieren imaging, induced by the plasma generated in a plasma jet have been studied in conditions used for biomedical treatments (jet being directed downwards with a low helium flow rate). It has been shown that the plasma action can shift up to few centimeters downstream the effects of buoyancy, which allows to the helium flow to reach a target below in conditions for which it is not the case when the plasma is off. This study reveals the critical role of large and long lifetime negative ions during repetitive operations in the kHz regime, inducing strong modifications in the gas propagation. The cumulative added streamwise momentum transferred to ambient air surrounding molecules resulting from a series of applied voltage pulses induces a gradual built up of a helium channel on tens of millisecond timescale. In some conditions, a remarkable stable cylindrical helium channel can be generated to the target with plasma supplied by negative polarity voltage pulses whereas a disturbed flow results from positive polarity operation. This has a direct effect on air penetration in the helium channel and then on the reactive species production over the target which is of great importance for biomedical applications. It has also been shown that with an appropriate combination of negative and positive polarity pulses, it is possible to benefit from both polarity features in order to optimize the plasma plume propagation and plasma delivery to a target.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://iopscience.iop.org/article/10.1088/1361-6595/aa8877
HAL Id:hal-01596263
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)
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Deposited By: Jérôme Fontane
Deposited On:27 Sep 2017 12:24

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