Effect of atmospheric-pressure plasma irradiation on the surface tension of water

Shirai, Naoki; Kaneko, Takuma; Takamura, Yuto; Sasaki, Koichi

doi:10.1088/1361-6463/ac48ad

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The chemical composition changed by plasma and heating effect also change the surface tension coefficient γ, which is different from pure NaCl solutions. An experiment shows that atmospheric plasma jets increase the surface tension coefficient of water from 75 to over 100 mN m −1 [63], suggesting that gas-liquid can withstand a larger pressure difference of 33% at the same curvature.…”

Section: Resultsmentioning

confidence: 99%

Estimation of total forces of jets on liquid interfaces using image processing methods

Guo,

et al. 2024

J. Phys. D: Appl. Phys.

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Optical imaging is a fundamental method for detecting plasma phenomena, such as plasma bubbles, plasma streamers, and self-organized plasma patterns. Therefore, data mining of images is crucial in plasma diagnostics. This work presents image processing methods for extracting substructures in plasma bubbles, streamers, and patterns. In our experiment, plasma-liquid interfaces between atmospheric pressure argon-plasma jets and NaCl solutions are quantitatively captured. After extracting accurate plasma-liquid interfaces, traditional analytic functions and machine learning approaches are used to fit curves of interfaces. Regression of machine learning method based on Gaussian process reveals many details of interfaces, but neural networks present smooth and accurate regressions. The gravitational and surface tension forces are calculated using experimental plasma-liquid interfaces. The plasma forces are estimated to be several tens of Pa. However, they increased to several hundred Pa around the inflection points of interfaces. This study extends the application of image processing to plasma diagnostics and provides target data of gas-liquid interfaces for numerical simulations.

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Section: Resultsmentioning

confidence: 99%

Estimation of total forces of jets on liquid interfaces using image processing methods

Guo,

et al. 2024

J. Phys. D: Appl. Phys.

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“…More importantly, it proves the possibility that a plasma actuator can operate normally in an environment where rainwater exists. 31 Regarding the control of flow separation, SDBD has primarily been applied for separation flow suppression investigations on airfoils, wings and compressors. [32][33][34] However, few investigations have been conducted on the inside of S-shaped inlets.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, it proves the possibility that a plasma actuator can operate normally in an environment where rainwater exists. 31 …”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of expansive bending pipe flow separation control using a surface dielectric barrier discharge plasma actuator

Liu,

Liang,

Zong

et al. 2023

Science Progress

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Adverse pressure gradients can cause severe flow separation within typical S-shaped inlets. This results in a total pressure distortion at the aerodynamic interface plane (AIP). The expansive bending pipe, where flow separation also occurs due to the adverse pressure gradient, is the basis for investigations into S-shaped inlets. In this study, surface dielectric barrier discharge (SDBD) plasma actuators are used to moderate the total pressure distortion in the AIP of an expansive bending pipe under a 10 m/s incoming flow. Also, the influences of actuation voltage amplitude and pulsed frequency on the total pressure distortion of the AIP are investigated under two plasma actuation modes, nanosecond pulsed SDBD and alternating current (AC) SDBD. Under optimal actuation parameters, the nanosecond pulsed SDBD and the AC-SDBD can reduce the distortion index by 14.93% and 32.22%, respectively. The results demonstrate the effectiveness of SDBD plasma actuators in suppressing flow separation within expansive bending pipes.

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Integrated Transport Model for Controlled Delivery of Short-Lived Reactive Species via Plasma-Activated Liquid with Practical Applications in Plant Disease Control

Kaneko,

Takashima,

Sasaki

2024

Plasma Chem Plasma Process

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Gas–liquid interfacial plasmas (GLIPs), specifically atmospheric-pressure plasmas (APPs) interacting with liquids, have garnered global interest for potential applications across various fields where reactive oxygen and nitrogen species (RONS) in both the gas and liquid phases could play a key role. However, APP-induced gas- and liquid-phase chemical reactions display spatially nonuniform features and involve a number of species; thus, they are extremely complicated and have not been fully understood and controlled. Herein, our primary focus is centered on elucidating RONS transport processes in GLIPs without direct plasma-liquid contact to reduce the complexity of this mechanism. Firstly, this review delineates the simplified transport models commonly found in general GLIP systems, including: (1) the transport of remotely generated gas-phase RONS to the liquid phase; (2) liquid-phase diffusion governing dissolution into the liquid phase and volatilization loss to the gas phase; and (3) chemical reactions in the liquid phase governing the generation and loss of short-lived RONS. Second, we delve into RONS transport using our laboratory-built plasma devices, aimed at sterilizing plant pathogens, interpreting results in line with the relevant transport models to aid the comprehension of the heterogeneous transport of RONS. Third, we discussed the innovative control of the plasma reaction process in the gas phase required to selectively synthesize N2O5, which is highly reactive at the gas–liquid interface. Finally, future prospects for the efficient utilization of unique reactions at the plasma/gas–liquid interface are discussed.

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Effect of atmospheric-pressure plasma irradiation on the surface tension of water

Cited by 4 publications

References 31 publications

Estimation of total forces of jets on liquid interfaces using image processing methods

Estimation of total forces of jets on liquid interfaces using image processing methods

Experimental investigation of expansive bending pipe flow separation control using a surface dielectric barrier discharge plasma actuator

Integrated Transport Model for Controlled Delivery of Short-Lived Reactive Species via Plasma-Activated Liquid with Practical Applications in Plant Disease Control

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