Atmospheric-pressure plasma jets : effect of gas flow, active species, and snake-like bullet propagation

Wu, S., Wang, Z., Huang, Q., Tan, X., Lu, X., & Ostrikov, K. (2013) Atmospheric-pressure plasma jets : effect of gas flow, active species, and snake-like bullet propagation. Physics of Plasmas, 20(2), 023503.

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Cold atmospheric-pressure plasma jets have recently attracted enormous interest owing to numerous applications in plasma biology, health care, medicine, and nanotechnology. A dedicated study of the interaction between the upstream and downstream plasma plumes revealed that the active species (electrons, ions, excited OH, metastable Ar, and nitrogen-related species) generated by the upstream plasma plume enhance the propagation of the downstream plasma plume. At gas flows exceeding 2 l/min, the downstream plasma plume is longer than the upstream plasma plume. Detailed plasma diagnostics and discharge species analysis suggest that this effect is due to the electrons and ions that are generated by the upstream plasma and flow into the downstream plume. This in turn leads to the relatively higher electron density in the downstream plasma. Moreover, high-speed photography reveals a highly unusual behavior of the plasma bullets, which propagate in snake-like motions, very differently from the previous reports. This behavior is related to the hydrodynamic instability of the gas flow, which results in non-uniform distributions of long-lifetime active species in the discharge tube and of surface charges on the inner surface of the tube.

Impact and interest:

19 citations in Scopus
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28 citations in Web of Science®

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ID Code: 74681
Item Type: Journal Article
Refereed: Yes
DOI: 10.1063/1.4791652
ISSN: 1070-664X
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 American Institute of Physics
Deposited On: 05 Aug 2014 00:15
Last Modified: 06 Aug 2014 00:24

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