Two enhancements in microwave-assisted spark ignition and their causes

Wang, Zhaowen; Liu, Chaohui; Xu, Jingxing; Cheng, Xiaobei; Chen, Jyh-Yuan; Zhang, Xinhua

doi:10.1016/j.combustflame.2023.112744

Cited by 6 publications

(2 citation statements)

References 47 publications

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“…Note that the transient plasma produced by ionization has a wide range of applications . For example, plasma with high electron density can be used for localized cutting, precise spraying, ignition, − etc. While plasma with low electron density can be applied in surface treatment, biomedical fields, etc.…”

Section: Resultsmentioning

confidence: 99%

On-Demand Transport Bubbles Adhering to Noncontiguous Patterned Superhydrophobic Surfaces Using a Superhydrophobic Tweezer

Zheng,

Tu,

et al. 2024

Langmuir

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Bubble transportation and related flotation are ubiquitous phenomena in nature and industry. Various surfaces with distinct morphologies and specific wettability properties have been engineered by organisms in nature and by humans to facilitate the targeted movement of bubbles. However, existing methods predominantly rely on continuous surfaces, limiting the ability of bubbles to deviate from their path before reaching their intended destination. Therefore, directional transportation of bubbles using noncontiguous surfaces still remains a significant challenge. Inspired by water spiders' ability to capture bubbles underwater using their hydrophobic surface for survival, we propose a novel transport strategy that utilizes patterned superhydrophobic surfaces (PSHSs) and a superhydrophobic tweezer. This strategy is implemented by switching between the hood mode and puncture mode of the moving three-phase contact lines to load and unload the bubble. To quantitatively evaluate the loss ratio of the bubble during transportation, a simple and exquisite bubble-weighing apparatus is devised. Our findings indicate that circular PSHSs demonstrate superior bubble adhesion and achieve the highest bubble transport ratio of 95.1%. In order to validate the promising application of this novel method, we employ the computer numerical control (CNC) technology to facilitate the autonomous loading and precise transportation of underwater bubbles, as well as the blending and ionization of combustible gas bubbles with air bubbles at different volume ratios.

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Section: Resultsmentioning

confidence: 99%

On-Demand Transport Bubbles Adhering to Noncontiguous Patterned Superhydrophobic Surfaces Using a Superhydrophobic Tweezer

Zheng,

Tu,

et al. 2024

Langmuir

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“…It was apparent that the MW power mainly governed the critical C NH3,i , affecting an almost linear increase of the critical C NH3,i with P MW , whereas the total flow rate was secondary, demonstrating relatively small negative impact on the critical C NH3,i for a given P MW (figure 4). MW discharge has been known to operate in a relatively low electric field, having difficulties in igniting by itself, and thus it requires an external source for seed elections to breakdown a gaseous media [42][43][44][45]. As ammonia was added, not only some portion of the total electron energy was transferred to NH 3 but also the excited states of Ar lost their energy due to the collisions with NH 3 , resulted in less ionization of Ar [38].…”

Section: Addition Of Ammoniamentioning

confidence: 99%

Ammonia cracking for hydrogen production using a microwave argon plasma jet

Zhang,

Cha

2023

J. Phys. D: Appl. Phys.

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Ammonia (NH3) is a promising hydrogen carrier that effectively connects producers of blue hydrogen with consumers, giving rapid conversion of ammonia to hydrogen a critical role in utilizing hydrogen at the endpoints of application in an ammonia-hydrogen economy. Because conventional thermal cracking of NH3 is an energy intensive process, requiring a relatively longer cold start duration, plasma technology is being considered as an assisting tool—or an alternative. Here we detail how an NH3 cracking process, using a microwave plasma jet (MWPJ) under atmospheric pressure, was governed by thermal decomposition reactions. We found that a delivered MW energy density (ED) captured the conversion of NH3 well, showing a full conversion for ED > 6 kJ l−1 with 0.5-% v/v NH3 in an argon flow. The hydrogen production rate displayed a linear increase with MW power and the NH3 content, being almost independent of a total flow rate. A simplified one-dimensional numerical model, adopting a thermal NH3 decomposition mechanism, predicted the experimental data well, indicating the importance of thermal decomposition in the plasma chemistry. We believe that such a prompt thermal reaction, caused by MW plasma, will facilitate a mobile and/or non-steady application. A process combined with the conventional catalytic method should also effectively solve a cold start issue.

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A review of microwave–metal discharge interaction: Mechanism, regulation, and application for synthesis of nanomaterials

Xie,

Shi,

et al. 2024

Nano Res.

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Two enhancements in microwave-assisted spark ignition and their causes

Cited by 6 publications

References 47 publications

On-Demand Transport Bubbles Adhering to Noncontiguous Patterned Superhydrophobic Surfaces Using a Superhydrophobic Tweezer

On-Demand Transport Bubbles Adhering to Noncontiguous Patterned Superhydrophobic Surfaces Using a Superhydrophobic Tweezer

Ammonia cracking for hydrogen production using a microwave argon plasma jet

A review of microwave–metal discharge interaction: Mechanism, regulation, and application for synthesis of nanomaterials

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