modeling atmospheric-pressure plasma and plasma chemistry (fa-gung fan and santokh badesha)

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Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010

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  • 1. Modeling Atmospheric-PressurePlasma and Plasma Chemistry Fa-Gung Fan* and Santokh S. Badesha Xerox Corporation 5/21/2010* http://www.linkedin.com/in/fagungfan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010

2. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 3. OutlineDC Coaxial Wire-Cylinder Corona DC Needle-Plate Corona Coplanar Dielectric Barrier Discharge (DBD) Streamer RF Plasma Needle (Plasma-induced Chemistry) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 4. Positive and Negative DC Wire-Cylinder Corona Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 5. Positive DC Wire-Cylinder Corona Photoemission,Secondary emission Wire radius: 100 microns Photoionization Cylinder radius: 5 mm Positive ionwire surfacePhotoemission, Number DensitySecondary emission Ionization ElectronModel domain and Groundboundary(E/N=120Td) computational mesh3500V (at wire surface) Negative ion (m) rcylinder wallFa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 6. Number Density in Ionization Region Present work Chen and Davidson, Plasma Chem. PlasmaPositive ion Process., 22, pp. 199-224, (2002) Negative ionElectron r (m) r(micron) wire Ionization wire surface boundarysurface(E/N=120Td)Note: The two are similar cases, but not identical. (The model domain and the boundary conditions are different.) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 7. Negative DC Wire-Cylinder CoronaPlasma boundary(E/N=80Td) Negative ionModel domain andGroundcomputational meshElectron -3000V(at wireIonizationsurface)boundary (E/N=120Td)Positive ionwire surface Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 8. Number Density in Ionization RegionPresent work Chen and Davidson, Plasma Chem. Plasma Process., 23(1), pp. 83-102, (2003) Positive ion Negative ionElectron r wire Ionization wiresurface boundarysurface(E/N=120Td)Note: The two are similar cases, but not identical.(The model domain and the boundary conditions are different.) Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 9. Positive and Negative DC Needle-Plate Corona Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 10. Positive DC Needle-Plate Corona(Axisymmetric model)Plate (grounded)Axis ofElectric Field Magnitude (surface) symmetry Electric Field (arrows) Electrical Potential (contour lines) Needle (900V) Positive Ion Density (surface) Positive Ion Flux (arrows) Electrical Potential (contour lines)Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 11. Electron Density and Ionization Boundary Ionization boundary(E/N=120Td) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 12. Negative DC Needle-Plate Corona(Axisymmetric model)Plate (grounded)Axis of symmetryElectron Density (surface) Electron Flux (arrows) Electrical Potential (contour lines) Needle (-900V)Negative Ion Density (surface)Negative Ion Flux (arrows) Electrical Potential (contour lines) Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 13. Electron Density, Ionization Boundary, and Plasma BoundaryPlasma boundary(80Td)Ionizationboundary (120Td) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 14. Number Density of Charge Species (Negative DC Needle-Plate Corona) Only the ionization region Ionization boundary(120Td) Negative ionPositive ion Negative ion ElectronPlasma boundary(80Td) Positive ion Electron(m)(m) z z Ionization Needleboundary Needle tip tip(120Td) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 15. Negative Charge Density ProfileCharging Profileat the Plate (Negative Charge Flux at the Plate)Negative ionElectronNegative ion Electron(m)(m) rrAxis of Axis of symmetrysymmetry Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 16. Streamer in Coplanar Dielectric-Barrier-Discharge (DBD) CoronaRef: Gibalov and Pietsch, J. Phys. D: Appl. Phys.,37, pp. 20822092 (2004) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 17. AirelectrodeelectrodeDielectric Electrode Configuration in a Coplanar DBD(2D Model)Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 18. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 19. Electron Density on the DielectricElectrical Potential at the DielectricSurface at Different TimeSurface at Different Time t (sec) t (sec) As the streamer propagating toward the cathode, the electrons generated by the ionization deposit on the dielectric surface at the location just above the anode (left figure). This charge build-up modifies the surface potential of the dielectric (right figure). The ions move slow, and the effect can be neglected in the time frame simulated. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 20. RF Plasma Needle and Plasma-induced Chemistry Ref: Sakiyama and Graves, J. Phys. D: Appl. Phys.,39(16), pp. 3644-3652 (2006) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 21. Plasma Needle for Medical Application 13.56MHz Brok et al., J. Appl. Phys., 98, p. 013302 (2005) Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 22. Brok et al., J. Appl. Phys., 98, p. 013302 (2005)Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 23. Brok et al., J. Appl. Phys., 98, p. 013302 (2005)Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 24. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 25. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 26. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 27. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 28. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 29. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010 30. SummaryDC Coaxial Wire-Cylinder Corona DC Needle-Plate Corona Coplanar Dielectric Barrier Discharge (DBD) Streamer RF Plasma Needle in He-N2 Mixture Fa-Gung FanAnnual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010

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