Effect of accumulated charges desorption in atmospheric pressure oxygen dielectric barrier discharge

Recently, atmospheric dielectric barrier discharges (DBDs) are widely applied to various fields, such as ozone generation, bio-medical field and so on. But less attentions on the mechanisms of accumulated charges behaviors between discharge space and dielectric surfaces. Golubovskii et al[1], simulated Atmospheric Pressure Townsend Discharges using one dimensional fluid model with considering the effect of the charge detachments. Recently, Itoh et al[2] also mentioned about desorption from dielectrics in DBDs. In the present paper, simulation with considering accumulated charges desorption by the electric field has been done using two dimensional fluid model[3]. The effect of electron desorption from the dielectrics affect significantly on the electron density distributions in the vicinity of the dielectrics. In the bulk region, less effect on the electron density distributions can be seen. And the charges accumulated on the dielectrics increase in positive on both dielectrics. As a result, the assumed condition of desorption would be inappropriate.[1] Y.B.Golubovskii, et al, J.Phys. D: Appl.Phys. 35, pp.751-761 (2002) [2] H.Itoh et al, ESCAMPIG XXIII, Bratislava, Slovakia, p.192 (2016)[3] G.Takahashi and H.Akashi, IEEE Trans. PS-39, 11, pp.234-235 (2011)