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29 Oct 2007

Volume 91, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 91, 183501 (2007); http://dx.doi.org/10.1063/1.2801554 (3 pages)

Aurelien Du Pasquier, Daniel D. T. Mastrogiovanni, Lauren A. Klein, Tong Wang, and Eric Garfunkel
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On the role of oxygen in dielectric barrier discharge actuation of aerodynamic flows

W. Kim, H. Do, M. G. Mungal, and M. A. Cappelli

Appl. Phys. Lett. 91, 181501 (2007); http://dx.doi.org/10.1063/1.2803755 (3 pages) | Cited 17 times

Online Publication Date: 29 October 2007

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Phase-locked particle image velocimetry is used to study the mechanism of induced flow in the near field of a rf dielectric barrier discharge actuator mounted in the separated flow region of a bluff body. Flow actuation is found to be asymmetric, with suction toward the buried downstream electrode when it is biased positively relative to the upstream exposed electrode. Lesser flow is seen on the reverse voltage swing, where the buried electrode should attract positive ions. This phenomenon is enhanced when oxygen is added to the flow, suggesting that oxygen negative ions, possibly O2−, play a dominant role in plasma actuation.
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52.30.-q Plasma dynamics and flow
47.85.Gj Aerodynamics
47.80.-v Instrumentation and measurement methods in fluid dynamics
47.65.-d Magnetohydrodynamics and electrohydrodynamics

Particle formation in acetylene very low-pressure high density magnetized plasmas

Maria Calafat, David Escaich, Richard Clergereaux, Patrice Raynaud, and Yvan Segui

Appl. Phys. Lett. 91, 181502 (2007); http://dx.doi.org/10.1063/1.2804007 (3 pages) | Cited 4 times

Online Publication Date: 1 November 2007

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Particle formation in cold plasmas is a matter of a large number of studies in capacitive, high-pressure, and low-density discharges. Conversely, under very-low working pressure and high plasma density conditions, as in microwave multipolar plasma excited at distributed electron cyclotron resonance (MMP-DECR), particle formation is generally not favored: the gas phase interaction probability is low due to the very-low working pressure. However, in this work, we report observations and analyses of particles formed in acetylene MMP-DECR discharges. It is proposed that the presence of the magnetic field compensates for the very-low working pressure inducing an increase in the gas phase interaction probability: negative ions are repelled by the sheath and confined within the magnetic field. Thus, particles can be formed similarly to in rf plasma.
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52.40.Hf Plasma-material interactions; boundary layer effects
52.40.Kh Plasma sheaths
52.80.-s Electric discharges
52.55.-s Magnetic confinement and equilibrium
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