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Boundary conditions32.
| Governing equations | Ground electrode boundary | Needle electrode boundary | Open boundary |
|---|---|---|---|
| Electron transport equation | Outflow flux
|
Flux of secondary electrons |
|
| Positive ion transport equation | Zero density
|
Outflow flux
|
|
| Negative ion transport equation | Outflow flux
|
Zero density
|
|
| Poisson equation | Ground potential | Positive DC potential | Zero charge
|
