PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet |
Hui-Min Xu(许慧敏)1, Jing-Ge Gao(高敬格)1, Peng-Ying Jia(贾鹏英)2,†, Jun-Xia Ran(冉俊霞)2, Jun-Yu Chen(陈俊宇)2, and Jin-Mao Li(李金懋)2,3 |
1 School of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, China; 2 College of Physics Science and Technology, Hebei University, Baoding 071002, China; 3 School of Electrical and Information Engineering, Heilongjiang University of Technology, Jixi 158100, China |
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Abstract Plasma jet has extensive application potentials in various fields, which normally operates in a diffuse mode when helium is used as the working gas. However, when less expensive argon is used, the plasma jet often operates in a filamentary mode. Compared to the filamentary mode, the diffuse mode is more desirable for applications. Hence, many efforts have been exerted to accomplish the diffuse mode of the argon plasma jet. In this paper, a novel single-needle argon plasma jet is developed to obtain the diffuse mode. It is found that the plasma jet operates in the filamentary mode when the distance from the needle tip to the central line of the argon stream (d) is short. It transits to the diffuse mode with increasing d. For the diffuse mode, there is always one discharge pulse per voltage cycle, which initiates at the rising edge of the positive voltage. For comparison, the number of discharge pulse increases with an increase in the peak voltage for the filamentary mode. Fast photography reveals that the plasma plume in the filamentary mode results from a guided positive streamer, which propagates in the argon stream. However, the plume in the diffuse mode originates from a branched streamer, which propagates in the interfacial layer between the argon stream and the surrounding air. By optical emission spectroscopy, plasma parameters are investigated for the two discharge modes, which show a similar trend with increasing d. The diffuse mode has lower electron temperature, electron density, vibrational temperature, and gas temperature compared to the filamentary mode.
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Received: 15 August 2023
Revised: 17 September 2023
Accepted manuscript online: 09 October 2023
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PACS:
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52.80.Tn
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(Other gas discharges)
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52.50.Dg
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(Plasma sources)
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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51977057, 11875121, and 11805013), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2020201025 and A2022201036), the Funds for Distinguished Young Scientists of Hebei Province, China (Grant No. A2012201045), the Natural Science Interdisciplinary Research Program of Hebei University (Grant No. DXK202011), and the Postgraduate’s Innovation Fund Project of Hebei University (Grant No. HBU2022bs004). |
Corresponding Authors:
Peng-Ying Jia
E-mail: jiapengying@hbu.edu.cn
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Cite this article:
Hui-Min Xu(许慧敏), Jing-Ge Gao(高敬格), Peng-Ying Jia(贾鹏英), Jun-Xia Ran(冉俊霞), Jun-Yu Chen(陈俊宇), and Jin-Mao Li(李金懋) Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet 2024 Chin. Phys. B 33 015205
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