Self consistent multi-fluid FDTD simulations of a nanosecond high power microwave discharge in air

Biabani, S.; Foroutan, G.

doi:10.1016/j.physleta.2018.06.048

Cited by 7 publications

(1 citation statement)

References 34 publications

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“…In a previous work, we presented a selfconsistent numerical model to study the diffusive mode of a HPM discharge in air and investigated the effects of variation in different parameters, such as the gas pressure, the width, frequency and amplitude of the microwave pulse on the properties of the plasma and evolution of the concentrations of the electrons, ions and radicals [53]. For the conditions considered there, the energy absorbed by the electrons from the wave field, was very high and as a result, the electron energy is effectively transferred into electronic states of the gas molecules and then to fast gas heating.…”

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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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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Finite-difference time-domain methods

Teixeira,

Sarris,

Zhang

et al. 2023

Nat Rev Methods Primers

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Transient analysis of light brightness emitted from high power microwave nitrogen breakdown under external dc magnetic field

et al. 2020

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A three-dimensional (3D) multi-physics model is developed to describe the characteristics of light emitted from high power microwave nitrogen breakdown. This model consists of electromagnetic (EM) fields and plasma physics in which plasma physics and EM fields are controlled by plasma fluid equations and Maxwell's equations. A continuity equation of excited molecule (ion) is introduced into the fluid model to describe the light brightness produced in the breakdown system. The resulting multi-physics system is analyzed and described with the spectral-element time-domain method. The external dc magnetic field applied in breakdown volume is used to prolong the breakdown time. The light brightness is weakened by the dc magnetic field before the occurrence of breakdown, and the variation in light brightness with different wavelengths produced by breakdown is discussed. The position of the maximum light brightness spot can be changed by the influence of the dc magnetic field on the electron concentration. Our research provides theoretical guidance for further understanding the physical process and physical phenomena in microwave nitrogen breakdown.

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Self consistent multi-fluid FDTD simulations of a nanosecond high power microwave discharge in air

Cited by 7 publications

References 34 publications

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

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

Finite-difference time-domain methods

Transient analysis of light brightness emitted from high power microwave nitrogen breakdown under external dc magnetic field

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