Publication Date:
2016-07-30
Description:
This work presents a numerical investigation, using a 1-D fluid model, on the generation and loss of oxygen-related species and the spatial-temporal evolutions of the species densities in the atmospheric-pressure pulsed dielectric barrier discharge in the argon/oxygen mixture. The reaction pathways as well as their contributions to the generation and loss of oxygen-related species are given. The considered oxygen-related species include O, O( 1 D), O 2 ( 1 Δ g ), O 3 , O + , O 2 + , O − , O 2 − , and O 3 − . The following significant results are obtained. O, O( 1 D), O 2 ( 1 Δ g ), and O − are produced mainly via the electron impact with O 2 . Ar + plays an essential role in the generation of O + and O 2 + . Almost all of O 3 derives from the reaction O 2 + O 2 + O → O 3 + O 2 . The O 3 -related reactions produce an essential proportion of O 2 − and O 3 − . The substantial loss of O − , O 2 − , and O 3 − is induced by their reactions with O 2 + . Loss of O + , O, and O( 1 D) is mainly due to their reactions with O 2 , loss of O 2 ( 1 Δ g ) due to O 2 ( 1 Δ g ) impacts with O 3 as well as the de-excitation reactions between O 2 ( 1 Δ g ) and e, O 2 , and O, and loss of O 3 due to the reactions between O 3 and other neutral species. In addition, the densities of O + and O( 1 D) present two obvious peaks at the pulse duration, but the densities of O 2 + , O, O 2 ( 1 Δ g ), and O 3 are almost unchanged. The densities of negative oxygen ions increase at the pulse duration and then decline. O − density is obviously large nearby the dielectric surfaces and the densities of O 2 − and O 3 − present generally uniform distributions.
Print ISSN:
1070-664X
Electronic ISSN:
1089-7674
Topics:
Physics
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