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Effects of ambient air on the characteristics of an atmospheric-pressure plasma jet of a gas mixture of highly N2-diluted O2 on a sliding substrate

We have performed numerical simulations of reaction kinetics and flow dynamics of an atmospheric-pressure plasma jet (APPJ) of a gas mixture of 99.9% N2 and 0.1% O2 in a two-dimensional flow channel with a height of 5 mm and investigated the effects of a sliding substrate and the substitution of the ambient gas. The sliding substrate in the flow channel produces the gas-drag effect, which results in not only the bending of the APPJ trajectory but also significant loss of atomic oxygen when the ambient gas is air. The flux of atomic oxygen integrated on the substrate is reduced to 19% of that integrated on the fixed substrate. We discuss the mechanisms of the reduction in the atomic oxygen flux through the analysis of spatial distributions of atomic oxygen loss reactions and show that the reduction in the atomic oxygen flux can be suppressed by substituting the ambient gas (air) with N2.