Neutral gas temperature maps of the pin-to-plate argon micro discharge into the ambient air

Xu, Shaofeng; Zhong, Xia; Majeed, Asif

doi:10.1063/1.4913654

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…While multiple studies examined the spatial distribution of temperature in discharge configurations common for activating water [13,[20][21][22][23], very few focused on the temperature distribution in the liquid phase and its consequences on the gas phase, which is the focus of this work. To conduct this analysis, a numerical model developed in an earlier work of the group was upgraded to account for heat transfer and water vaporization at the plasma-liquid interface [24].…”

Section: Introductionmentioning

confidence: 99%

Resolving the spatial scales of mass and heat transfer in direct plasma sources for activating liquids

Silsby

Dickenson²,

Walsh³

et al. 2022

Front. Phys.

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When plasma is in direct contact with liquid, an exchange of mass and heat between the two media occurs, manifested in multiple physical processes such as vaporization and multiphase heat transfer. These phenomena significantly influence the conditions at the plasma–liquid interface and interfere with other processes such as the multiphase transport of reactive species across the interface. In this work, an experimentally validated computational model was developed and used to quantify mass and energy exchange processes at a plasma–liquid interface. On the liquid side of the interface, it was shown that a thin film of liquid exists where the temperature is approximately three times higher than the bulk temperature, extending to a depth of 10 μm. As the depth increased, a strongly nonlinear decrease in the temperature was encountered. On the plasma side of the interface, plasma heating caused background gas rarefaction, resulting in a 15% reduction in gas density compared to ambient conditions. The combined effect of gas rarefaction and liquid heating promoted vaporization, which increased liquid vapor density in the plasma phase. When water is the treated liquid, it is shown that water vapor constitutes up to 30% of the total gas composition in the region up to 0.1 mm from the interface, with this percentage approaching 70–80% of the total gas composition when the water’s temperature reaches its boiling point.

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Section: Introductionmentioning

confidence: 99%

Resolving the spatial scales of mass and heat transfer in direct plasma sources for activating liquids

Silsby

Dickenson²,

Walsh³

et al. 2022

Front. Phys.

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Non-linear macro evolution of a dc driven micro atmospheric glow discharge

Zhong

2015

Physics of Plasmas

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We studied the macro evolution of the micro atmospheric glow discharge generated between a micro argon jet into ambient air and static water. The micro discharge behaves similarly to a complex ecosystem. Non-linear behaviors are found for the micro discharge when the water acts as a cathode, different from the discharge when water behaves as an anode. Groups of snapshots of the micro discharge formed at different discharge currents are captured by an intensified charge-coupled device with controlled exposure time, and each group consisted of 256 images taken in succession. Edge detection methods are used to identify the water surface and then the total brightness is defined by adding up the signal counts over the area of the micro discharge. Motions of the water surface at different discharge currents show that the water surface lowers increasingly rapidly when the water acts as a cathode. In contrast, the water surface lowers at a constant speed when the water behaves as an anode. The light curves are similar to logistic growth curves, suggesting that a selfinhibition process occurs in the micro discharge. Meanwhile, the total brightness increases linearly during the same time when the water acts as an anode. Discharge-water interactions cause the micro discharge to evolve. The charged particle bomb process is probably responsible for the different behavior of the micro discharges when the water acts as cathode and anode.

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Mass transfer of the multicomponent free jet and one numerical implementation on a graphic processing unit platform

Xu¹,

Gu²,

Fang³

et al. 2023

Physics of Fluids

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Jet flows are ubiquitous in nature and laboratories. For example, helium and argon jets into ambient air are commonly used to produce atmospheric plasma jets. The jets before and after discharge both are typical multicomponent flows. This study reports on the implementation of a numerical solver based on the graphic processing units to model multicomponent mixture gas flows. To this end, two- and three-dimensional Jacobian matrices for the multicomponent Euler equations were obtained to reconstruct numerical fluxes and build a total variation diminishing scheme. The two-dimensional early-stage mass transfer of gas jets was studied for three mixture gases: He/air, Ar/air, and N2/air to numerically verify the steady functioning of the numerical solver despite the high mass fraction gradients. The mass fraction distribution of helium in ambient air exhibited more complex substructures than those of argon and nitrogen in ambient air. Using the watershed method, self-generated bullets were extracted from the mass fraction distributions of the helium jet. The proposed numerical solver implemented in this study is expected to provide a better understanding of gas jet dynamics, and the Jacobian matrices can provide a mathematical foundation for constructing potential higher schemes.

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Neutral gas temperature maps of the pin-to-plate argon micro discharge into the ambient air

Cited by 3 publications

References 26 publications

Resolving the spatial scales of mass and heat transfer in direct plasma sources for activating liquids

Resolving the spatial scales of mass and heat transfer in direct plasma sources for activating liquids

Non-linear macro evolution of a dc driven micro atmospheric glow discharge

Mass transfer of the multicomponent free jet and one numerical implementation on a graphic processing unit platform

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