Two-dimensional simulation of fast gas heating in an atmospheric pressure streamer discharge and humidity effects

Komuro, Atsushi; Ono, Ryo

doi:10.1088/0022-3727/47/15/155202

Cited by 76 publications

(100 citation statements)

References 55 publications

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“…Those field conditions are conducive to the generation of high energy electrons and subsequently to the efficient production of specific reactive species. Indeed, not only the density but also the nature of these species depend highly on the electron energy distribution function (EEDF) and therefore on the electric field [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Energy relaxation and heating in the afterglow of high electric field ns-discharges in ambient air using spontaneous Raman scattering

Brisset¹,

Guichard²,

Cessou³

et al. 2021

Plasma Sources Sci. Technol.

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The spatio-temporal rovibrational excitation and relaxation mechanisms of N2(X) in the post-discarge of a 10 ns high-voltage diffuse discharge are studied by Spontaneous Raman Scattering. It is shown that the vibrational excitation of nitrogen molecules remains high despite the strong electric fields applied during the discharge itself and the relaxation processes are similar to lower voltage ns discharges. The main differences with the lower field discharges are rather visible at the beginning of the discharge with a specific spatial volume distribution and a significant vibrational non-equilibrium between v=0,1 and v>1. The spatial distribution of the rovibrational excitation of the diffuse discharge is very wide radially, consistent with the sustainability of fields greater than 100 Td over nearly 8 mm during propagation. The initial rovibrational excitation is inhomogeneous along the axis. The gas temperature reaches up to about 1200 K close to the pin (85 kV, ambient air) while it remains below 500 K in the rest of the volume. It is possible to control the heating of the discharge without greatly modifying the energy transfer mechanisms by adjusting the duration of the voltage pulse. In terms of reactivity, high atomic oxygen densities seem to be very localized in the vicinity of the pin (10 24 m -3 at 1.5 mm from the pin, corresponding to about 20 % dissociation). This inhomogeneity reflects the distribution of energy in the volume of the discharge. The main effects of humidity are also studied. It amplifies the fast heating and accelerates the decay of atomic oxygen in the post-discharge. No significant acceleration of the V-T relaxation of nitrogen due to the addition of water vapour was observed for the studied conditions. A shock wave was identified which is triggered at around 500 ns.

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Section: Introductionmentioning

confidence: 99%

Energy relaxation and heating in the afterglow of high electric field ns-discharges in ambient air using spontaneous Raman scattering

Brisset¹,

Guichard²,

Cessou³

et al. 2021

Plasma Sources Sci. Technol.

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“…These conditions are met in high-voltage nanosecond discharges that are being increasingly used for aerodynamic flow control [8,9], plasma-assisted combustion [10][11][12], material processing [13] and for some other applications. That is why much attention has been given to experimental [6,[14][15][16][17][18] and computational [6,7,[19][20][21][22][23] studies of fast gas heating in nanosecond discharges and in their afterglows. Available measurements are usually limited by not-too-high values of E/N.…”

Section: Introductionmentioning

confidence: 99%

Fast gas heating in N ₂ /O ₂ mixtures under nanosecond surface dielectric barrier discharge: the effects of gas pressure and composition

Nudnova

Kindysheva

Aleksandrov

et al. 2015

Phil. Trans. R. Soc. A.

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“…Due to the importance of gas heating for various applications, numerous research works have been devoted to the study of the dynamics of heat release in air plasmas [32,[34][35][36][37][38][39][48][49][50][51][52]. Popov developed a model of rapid gas heating in nitrogen-oxygen mixture by considering the dissociation of oxygen molecules by direct electron impact and via quenching of the electronically excited nitrogen molecules.…”

Section: Introductionmentioning

confidence: 99%

Energy Balance and Gas Thermalization in a High Power Microwave Discharge in Mixtures

Biabani

Foroutan

2019

IJOP

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The dynamics of fast gas heating in a high power microwave discharge in air, is investigated in the framework of FDTD simulations of the Maxwell equations coupled with the fluid simulations of the plasma. It is shown that, an ultra-fast gas heating of the order of several 100 Kelvins occurs in less than 100 ns. The main role in the heating is played by the electron impact dissociation of 2 O , dissociation via quenching of metastable states of 2 N , as well as, ( ) 1 OD quenching by nitrogen molecules. Among the electronically excited metastable states, ( ) 2 N B, C, a are the most important species. Slow heating of the gas above 1 μs is attributed to the vibrational relaxation processes of 2 N , among them vibrationaltranslational relaxation of 2 N demonstrates the highest heating rate. The heating rate and thus the gas temperature are significantly increased with increasing of the microwave pulse amplitude, pulse width, and the gas pressure. In all cases, enhanced 2 O dissociation is the main factor behind the enhanced gas heating. The same effects are observed for increasing of the initial gas temperature, and 2 O percentage in a 22 N -O mixture.

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Two-dimensional simulation of fast gas heating in an atmospheric pressure streamer discharge and humidity effects

Cited by 76 publications

References 55 publications

Energy relaxation and heating in the afterglow of high electric field ns-discharges in ambient air using spontaneous Raman scattering

Energy relaxation and heating in the afterglow of high electric field ns-discharges in ambient air using spontaneous Raman scattering

Fast gas heating in N ₂ /O ₂ mixtures under nanosecond surface dielectric barrier discharge: the effects of gas pressure and composition

Energy Balance and Gas Thermalization in a High Power Microwave Discharge in Mixtures

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Two-dimensional simulation of fast gas heating in an atmospheric pressure streamer discharge and humidity effects

Cited by 76 publications

References 55 publications

Energy relaxation and heating in the afterglow of high electric field ns-discharges in ambient air using spontaneous Raman scattering

Energy relaxation and heating in the afterglow of high electric field ns-discharges in ambient air using spontaneous Raman scattering

Fast gas heating in N 2 /O 2 mixtures under nanosecond surface dielectric barrier discharge: the effects of gas pressure and composition

Energy Balance and Gas Thermalization in a High Power Microwave Discharge in Mixtures

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Fast gas heating in N ₂ /O ₂ mixtures under nanosecond surface dielectric barrier discharge: the effects of gas pressure and composition