Journal article
Self-rotating dc atmospheric-pressure discharge over a water-surface electrode: regimes of operation
Plasma sources science & technology, v 17(4), p045001
01 Nov 2008
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A dc atmospheric-pressure glow discharge produced between a metallic electrode and a water electrode is studied in this experiment. The discharge is characterized by means of visualization, high-speed imaging, voltage-current measurements, mass spectrometry and temperature measurements. Under certain conditions, the discharge exhibits a distinctive rotating motion in which the cathode spot remains stationary and the anode spot traces a circular pattern. Regimes of rotation occur in general at lower currents, at larger discharge gap lengths and when the water surface is the anode. Temperature measurements made in the rotating and stationary regimes show similar trends. Various metallic electrode materials, electrode geometries and discharge gases are investigated to determine the conditions under which rotation occurs. Rotation is only observed with a smooth cathode and a non-oxidizing anode material, such as water (or gold surface) that is either flat or otherwise provides no hindrances to the movement of the anode spot. Rotation is observed to occur in air and N-2-H-2 mixtures but not in pure N-2, H-2 or He; this suggests chemical mechanisms resulting in the formation of electronegative species as a possible cause for the rotation. Finally, measurements of the frequency of rotation of the discharge with respect to discharge length and current are made. These qualitative and quantitative results are used to evaluate various types of interactions as potential causes of this behavior.
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Details
- Title
- Self-rotating dc atmospheric-pressure discharge over a water-surface electrode: regimes of operation
- Creators
- Alyssa Wilson - Drexel UniversityDavid Staack - Drexel UniversityTanvir Farouk - Drexel UniversityAlexander Gutsol - Drexel UniversityAlexander Fridman - Drexel UniversityBakhtier Farouk - Drexel University
- Publication Details
- Plasma sources science & technology, v 17(4), p045001
- Publisher
- Iop Publishing Ltd
- Number of pages
- 12
- Grant note
- DMII-0423409 / US National Science Foundation; National Science Foundation (NSF) DMII-0423409 / NSF/REU; National Science Foundation (NSF); NSF - Office of the Director (OD)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000260891600001
- Scopus ID
- 2-s2.0-67649848221
- Other Identifier
- 991019168345904721
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- Web of Science research areas
- Physics, Fluids & Plasmas