Modeling of atmospheric gas-stream processing using a microwave excited all-dielectric resonant plasma discharge

Sharma, Ashish; Upadhyay, Rochan; Karpatne, Anand; Subramaniam, Vivek; Breden, Douglas; Raja, Laxminarayan L.

doi:10.1088/1361-6463/ac17b6

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…The fully coupled quasi-neutral model takes into consideration important wave-plasma interactions that have been omitted in previous numerical studies of such devices. Although the model remains quite simplified in terms of plasma chemistry and quasi-neutral in nature, in contrast to more sophisticated models such as in [37,[40][41][42][43] (nonexhaustive list) which have been applied to high-frequency plasmas, it allows for understanding important aspects of micro-discharges and performing efficiently parametric studies. First, we present briefly some modelling aspects and the simulation conditions (section 2).…”

Section: Introductionmentioning

confidence: 99%

Full-wave and plasma simulations of microstrip excited, high-frequency, atmospheric pressure argon microdischarges

Kourtzanidis

2023

Plasma Sources Sci. Technol.

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Two-dimensional fully coupled EM wave-plasma simulations are used to study the formation, early transient and quasi-steady state of the argon plasma excited by a two-dimensional discontinuous microstrip line. The electromagnetic waves that normally propagate in the microstrip transmission line, radiate and scatter at the position of the gap and the electric field is enhanced primarily at the corner of the gap. The microdischarge is preferentially formed at this position of the EM field hotspot and in low frequencies propagates on the dielectric surface, much like a microwave surface streamer. In longer times, diffusion dominates and the whole gap is filled with plasma of maximum density in the order of $10^{20}$ $m^{-3}$ while it occupies a volume larger than the gap. Mean electron temperatures range from 2.8 to 3.9 eV, while the plasma reaches a quasi-static regime in approximately 2 $\mu$ s having reconfigured the transmission and radiation patterns of the slitted microstrip line. The tunability of the microstrip due to plasma formation provides means for sustaining the discharge in a stable regime. For the same input EM power, the electron temperature increases with increasing excitation frequency while electron densities found to decrease. For the same wave frequency, a decrease of the electron densities with increasing gap is also found in addition to a restriction of the discharge expansion. Finally, thicker dielectrics result to higher electron densities and electron temperatures as well as absorbed power from the plasma. These findings are attributed to the dependence of absorbed EM power and skin depth on the EM wave angular frequency, the critical for shielding electron density as well as the restructuring of the S-parameters due to the changes in operational parameters.

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Section: Introductionmentioning

confidence: 99%

Full-wave and plasma simulations of microstrip excited, high-frequency, atmospheric pressure argon microdischarges

Kourtzanidis

2023

Plasma Sources Sci. Technol.

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Microwave atmospheric pressure plasma jet: A review

Rath,

Kar

2024

Contrib. Plasma Phys

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Considerable interest has emerged in atmospheric pressure discharges within the microwave frequency range over the past decade, driven by the growing potential applications such as material processing, CO2 dissociation, waste treatment, hydrogen production, water treatment, and so forth. This review delves into the diverse types of atmospheric pressure plasma jets (APPJs) operated at microwave frequencies. The analysis integrates insights from an overall review that encapsulates the different types of geometry, characterizations, modeling, and various applications of microwave atmospheric plasma jets (MW‐APPJs). This paper will contribute to a comprehensive understanding of microwave plasma generated in the ambient atmosphere. The fundamental insights into these discharges are emerging, but there are still numerous unexplained phenomena in these inherently complex plasmas that need to be studied. The properties of these MW‐APPJs encompass a higher range of electron densities (ne), gas temperatures (Tg), electron temperatures (Te), and reactive oxygen and nitrogen species (RONS). This review provides an overview of the key underlying processes crucial for generating and stabilizing MW‐APPJs. Additionally, the unique physical and chemical properties of these discharges are summarized. In the initial section, we aim to introduce the primary scientific characterizations of different types of waveguide‐based and non‐waveguide‐based MW‐APPJs. The subsequent part focuses on the diverse modeling approaches for different MW‐APPJs and the outcomes derived from these models. The final section describes the potential applications of MW‐APPJs in various domains.

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Computational study of a helium-propellant microwave electrothermal thruster

Lee,

Raja

2024

Journal of Applied Physics

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The microwave electrothermal thruster (MET) utilizes wave-exited microdischarges to heat gas flows, enhancing the specific impulse of the thruster. Our computational study investigates a 17.5 GHz helium-propellant MET, employing a two-dimensional, axisymmetric fluid model of plasma coupled with electromagnetic wave and gas flows. The discharges operate in the glow regime, remaining weakly ionized, and in thermal non-equilibrium. The plasma densities reach approximately 1020m−3, and the gas temperature is around 2000 K. Even a slight off-resonant frequency operation results in a significantly lower plasma density and gas temperature. Gas heating, primarily driven by electromagnetic Joule heating, plays a critical role in influencing the overall discharge behavior. The measured peak thrust and specific impulse are 8.24 mN and 292 s, respectively, at a mass flow rate of 3.2 mg/s with 30 W of power. Compared to a cold gas thruster, there is a significant increase in the specific impulse by a factor of approximately 1.7. The enhanced performance trades off with propulsive efficiency, which decreases by a factor of 1.5 from the peak 65% at 10 W. This is due to higher energy losses to cavity walls from heat conduction with increased power. These findings underscore the critical balance between the input power and mass flow rate to improve the MET performance, highlighting the importance of power management to maximize thrust and efficiency. Furthermore, the predicted thrust and specific impulse agree well with experimental values for nominally similar MET thruster studies in the literature.

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Modeling of atmospheric gas-stream processing using a microwave excited all-dielectric resonant plasma discharge

Cited by 4 publications

References 42 publications

Full-wave and plasma simulations of microstrip excited, high-frequency, atmospheric pressure argon microdischarges

Full-wave and plasma simulations of microstrip excited, high-frequency, atmospheric pressure argon microdischarges

Microwave atmospheric pressure plasma jet: A review

Computational study of a helium-propellant microwave electrothermal thruster

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