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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Modeling Atmospheric-Pressure Plasma and Plasma Chemistry (Fa-Gung Fan and Santokh Badesha)

  1. 1. Modeling Atmospheric-Pressure Plasma 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. 2. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  3. 3. Outline DC 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. 4. Positive and Negative DC Wire-Cylinder Corona Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  5. 5. Positive DC Wire-Cylinder Corona Photoemission, Secondary emission Wire radius: 100 microns Photoionization Cylinder radius: 5 mm Positive ion wire surface Photoemission, Number Density Secondary emission Ionization Electron Model domain and Ground boundary (E/N=120Td) computational mesh 3500V (at wire surface) Negative ion (m) r cylinder wall Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  6. 6. Number Density in Ionization Region Present work Chen and Davidson, Plasma Chem. Plasma Positive ion Process., 22, pp. 199-224, (2002) Negative ion Electron r (m) r (micron) wire Ionization wire surface boundary surface (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. 7. Negative DC Wire-Cylinder Corona Plasma boundary (E/N=80Td) Negative ion Model domain and Ground computational mesh Electron -3000V (at wire Ionization surface) boundary (E/N=120Td) Positive ion wire surface Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  8. 8. Number Density in Ionization Region Present work Chen and Davidson, Plasma Chem. Plasma Process., 23(1), pp. 83-102, (2003) Positive ion Negative ion Electron r wire Ionization wire surface boundary surface (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
  9. 9. Positive and Negative DC Needle-Plate Corona Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  10. 10. Positive DC Needle-Plate Corona (Axisymmetric model) Plate (grounded) Axis of Electric 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 Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  11. 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. 12. Negative DC Needle-Plate Corona (Axisymmetric model) Plate (grounded) Axis of symmetry Electron 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 Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  13. 13. Electron Density, Ionization Boundary, and Plasma Boundary Plasma boundary (80Td) Ionization boundary (120Td) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  14. 14. Number Density of Charge Species (Negative DC Needle-Plate Corona) Only the ionization region Ionization boundary (120Td) Negative ion Positive ion Negative ion Electron Plasma boundary (80Td) Positive ion Electron (m) (m) z z Ionization Needle boundary Needle tip tip (120Td) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  15. 15. Negative Charge Density Profile Charging Profile at the Plate (Negative Charge Flux at the Plate) Negative ion Electron Negative ion Electron (m) (m) r r Axis of Axis of symmetry symmetry Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  16. 16. Streamer in Coplanar Dielectric-Barrier- Discharge (DBD) Corona Ref: Gibalov and Pietsch, J. Phys. D: Appl. Phys., 37, pp. 2082–2092 (2004) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  17. 17. Air electrode electrode Dielectric Electrode Configuration in a Coplanar DBD (2D Model) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  18. 18. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  19. 19. Electron Density on the Dielectric Electrical Potential at the Dielectric Surface at Different Time Surface 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. 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. 21. Plasma Needle for Medical Application 13.56MHz Brok et al., J. Appl. Phys., 98, p. 013302 (2005) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  22. 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. 23. Brok et al., J. Appl. Phys., 98, p. 013302 (2005) Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  24. 24. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  25. 25. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  26. 26. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  27. 27. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  28. 28. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  29. 29. Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010
  30. 30. Summary DC Coaxial Wire-Cylinder Corona DC Needle-Plate Corona Coplanar Dielectric Barrier Discharge (DBD) – Streamer RF Plasma Needle in He-N2 Mixture Fa-Gung Fan Annual CAMP Technical Meeting, Canandaigua, NY, 5/19-21, 2010

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