Ozone and oxygen atoms production in a dielectric barrier discharge in pure oxygen and O₂/CH₄ mixtures. Modeling and experiment

Abstract

This paper describes the results of modeling of a dielectric barrier discharge (DBD). Filamentary structure of DBD is taken into account in the model by introducing the ratio of the cross section area of a microdischarge to the electrode area as a parameter of the model. Discharge and afterglow stages in the gas flow were studied using a zero-dimensional model for a DBD microdischarge channel. The results of modeling are compared with literature data for [O] number densities in a single pulse nanosecond discharge, and with our own measurements of ozone formation in the DBD. Measurements of ozone number density in oxygen and in mixtures of oxygen with methane served as means of validating the DBD model. The best agreement of the calculated and experimental dependences of [O 3 ] number densities on the discharge energy load was observed, when processes involving vibrationally excited ozone were accounted for together with the discharge microstructure.

Ozone production in a dielectric barrier discharge in air- and oxygen–methane mixtures. Experiment and modeling

“…Therefore, decrease in [O 3 ] with power load and [CH 4 ] resulted from temperature rise, that slowed ozone formation rate, and destruction of O 3 by the chain mechanism initiated by H atoms, appeared as the result of partial CH 4 dissociation. The model and the experiment [14] exhibited satisfactory agreement for the O 2 /CH 4 mixtures with relatively large equivalence ratios (ϕ = 0.22 and 0.44). However, later we found that model [14] could not adequately describe formation of O 3 in air and in air/CH 4 and O 2 /CH 4 mixtures with relatively small additions of methane.…”

“…The model and the experiment [14] exhibited satisfactory agreement for the O 2 /CH 4 mixtures with relatively large equivalence ratios (ϕ = 0.22 and 0.44). However, later we found that model [14] could not adequately describe formation of O 3 in air and in air/CH 4 and O 2 /CH 4 mixtures with relatively small additions of methane.…”

“…Recently [14], we suggested the DBD model for oxygen and its mixtures with CH 4 , where ozone was produced in microdischarges stochastically distributed over the electrode surface. Total discharge area was assumed considerably smaller than the electrode surface.…”

Influence of flow regime on the decomposition of diluted methane in a nitrogen rotating gliding arc

“…Figure 4 a shows the schematic of the procedure adapted for the 0-D chemical kinetics simulation. The VIBRKIN reactor module of Chemical Workbench software, a well-developed and proprietary software of M/s Kintech Laboratory 41 was used to solve the non-equilibrium plasma reactions together with the heavy particle reactions 26 , 42 – 45 . A total of 81 species were included in the model, which react to each other through 274 reactions, detailed in Table SI of the Supplementary Material.…”

Influence of transitional and turbulent flow on electrical, optical, morphological and chemical characteristics of a nitrogen rotating gliding arc

“…The VIBRKIN reactor model available in the Chemical Workbench software of M/s Kintech Laboratory [45] was used to solve the nonequilibrium plasma reactions together with the thermal reactions [46][47][48][49]. A total of 53 processes were included in the mechanism to describe the N 2 -RGA discharge as best as possible, shown in table SII of the supplementary material.…”