Numerical Studies on the Downstream Uniformity Modulation of Atmospheric Pressure Cold Plasma Jet Array via Gas Flow Controlling Strategy

Zheng, S X; Nie, Qiulin; Hou, Chunfeng; Wang, Xiaogang

doi:10.1109/tps.2019.2926157

Cited by 6 publications

(7 citation statements)

References 32 publications

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“…Jet-to-jet interaction has recently attracted attention for its inevitable effect on the close downstream plasma plumes, revealing that jet arrays are more complicated than a simple combination of APPJs [17,24]. The adjacent plumes influenced by jet-to-jet interaction often show a state of repulsion, attraction or fusion, which theoretically are attributed to the complex electrical and hydrodynamic interactions induced by charged particles, gas flows, and long-living species [27,28]. Electrical interaction refers to the electrostatic couplings among proximal ionization waves (IWs).…”

Section: Introductionmentioning

confidence: 99%

Mode transition in 1D He plasma jet arrays dominated by hydrodynamic interaction

Zhang¹,

Xu²,

Yang³

et al. 2021

Plasma Sources Sci. Technol.

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As an emerging technology for flexibly generating large-area atmospheric plasma, jet arrays are facing an urgent problem to control discharge modes caused by jet-to-jet interactions, apart from issues of stability and uniformity. Here, two modes in one-dimensional ns-pulsed He plasma jet arrays are reported, namely coupling and collimated modes. Discharge characteristics and transition rules of the two modes are explored by optical, electrical, spatial-temporal resolved and Schlieren methods. Results reveal that the coupling mode appears only when multiple conditions are satisfied, including low gas flow rate, high voltage frequency and small jet separation. Fluid dynamics and intensified charged-coupled device images prove that the mode transition mainly depends on the hydrodynamic interaction, which exceeds the effect of electrostatic repellence between ionization waves. Shrinkage of He flows is visualized to be enhanced at coupling mode, contributing to inward deflection of outmost plasma jets. Eddies on both sides of jet array and low-pressure regions near nozzles are generated by electric winds, promoting the transversal momentum transfer and gas fusion among adjacent He flows, thus tending to jet couplings. Some fresh insights are provided in this work about jet coupling and generation of controllable large-area plasma sources. The results could help to understand the importance of hydrodynamic interaction among proximal plasma jets, and plasma action on adjacent gas flows.

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Section: Introductionmentioning

confidence: 99%

Mode transition in 1D He plasma jet arrays dominated by hydrodynamic interaction

Zhang¹,

Xu²,

Yang³

et al. 2021

Plasma Sources Sci. Technol.

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“…A multi-field coupling model developed from [18,21] is used in this work for the APPJ arrays with a number of jet outlets. It can compute the spatial-temporal evolutions of the plasma and active species distributions with the electric field as well as the temperature distributions by solving equations of Navier-Stokes (NS), Poisson, continuity, and electron energy.…”

Section: The Appj Modelmentioning

confidence: 99%

“…The density distributions of reactive species, especially reactive oxygen species such as O and OH, are vital for practical applications. Therefore, based on the model with 10 species and nine reactions developed in [18,21], an improvement is made herein to enrich the chemical reactions, where 28 species and 61 reactions [31][32][33][34][35] are applied, as shown in table 1.…”

Section: The Appj Modelmentioning

confidence: 99%

“…In the flow field control, attempts of closely packing APPJs are successful in both experiments and simulations to mitigate the mottling patterns downstream [19,20]. The homogeneity of the plasma is also upgraded by applying He inflow between adjacent jets [21].…”

Section: Introductionmentioning

confidence: 99%

“…For a flow field, the existence of a downstream substrate can change the initial gas distribution. Thus, the uniformity of the working gas as well as the plasma may get better due to the crossing flow near the surface of the substrates [21,23]. For an electric field, the dielectric constant of the substrate directly affects the electric potential as a boundary condition to determine the charge density distribution [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of atmospheric jet-array plasma uniformity assisted by artificial neural networks

Zheng

Nie

Huang

et al. 2023

Plasma Sci. Technol.

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Atmospheric pressure plasma jet arrays have shown a potential in wide applications ranging from material processing to biomedicine. In these applications, targets with complex three-dimensional structures often easily affect plasma uniformity. However, the uniformity is usually crucially important in application areas such as biomedicine etc. In this work, the flow and electric field collaborative modulations are used to improve the uniformity of the plasma downstream. Taking a two-dimensional sloped metallic substrate with 10° inclined angle as an example, the influences of both flow and electric field on the electron and typical active species distributions downstream are studied based on a multi-field coupling model. The electric and flow fields modulations are first separately applied to test the influence. Results show that the electric field modulation has an obvious improvement on the uniformity of plasma while the flow field modulation effect is limited. Based on such outputs, a collaborative modulation of both fields is then applied, and shows a much better effect on the uniformity. To make further advances, a basic strategy of uniformity improvement is thus acquired. To achieve the goal, an artificial neural network (ANN) method with reasonable accuracy is then used to predict the correlation between plasma processing parameters and downstream uniformity properties for further improvement of the plasma uniformity. An optional scheme taking advantage of the flexibility of atmospheric pressure plasma jet arrays is then developed for practical demands.

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Numerical studies on downstream uniformity of atmospheric pressure plasma jet array modulated by flow and electric multi-field coupling control

et al. 2021

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Atmospheric pressure plasma jets (APPJs) have potential applications in many aspects ranging from traditional surface treatment to growing biomedicine. An array structure of such APPJs is the most efficient way to enlarge the treatment area. Nevertheless, the majority of APPJ arrays have shown mottled patterns downstream, a disadvantage for applications. Particularly, in biomedicine and certain other areas, improving the plasma homogeneity downstream of APPJ arrays is crucially needed. In this work, we numerically study synergistic effects of APPJ arrays on plasma propagation and homogeneity downstream based on a model coupling electric, flow, and temperature fields. Taking a two-dimensional three-tube APPJ array as an example, we study the influence of gas velocity and component, as well as applied voltages on plasma distributions. In addition, essential strategies for merging plasma bullets are acquired. Results show that the ionization rate between adjacent jets is important to provide electrons for jet merging. The helium mole fraction controls the plasma distribution and thus directly decides whether adjacent jets merge. After merging, the plasma bullets affect each other through the electric field to control the homogeneity downstream. Therefore, the plasma distribution is a result of the synergy of flow and electric fields. Then, a homogeneous plasma distribution downstream can be realized by the fine control of both fields, which provides an effective way to uniform the plasma downstream in plasma processing.

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Numerical Studies on the Downstream Uniformity Modulation of Atmospheric Pressure Cold Plasma Jet Array via Gas Flow Controlling Strategy

Cited by 6 publications

References 32 publications

Mode transition in 1D He plasma jet arrays dominated by hydrodynamic interaction

Mode transition in 1D He plasma jet arrays dominated by hydrodynamic interaction

Improvement of atmospheric jet-array plasma uniformity assisted by artificial neural networks

Numerical studies on downstream uniformity of atmospheric pressure plasma jet array modulated by flow and electric multi-field coupling control

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