Feather-like He plasma plumes in surrounding N2 gas

Xian, Yuezhong; Zou, Dan Dan; Lü, Xing; Pan, Yuan; Ostrikov, Kostya Ken

doi:10.1063/1.4820148

Cited by 26 publications

(25 citation statements)

References 32 publications

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“…In addition, The velocity of about (1.2-1.6) 10 5 m/s corresponds to the calculated electron drift velocity at electric fields of 10-14 kV/cm which are similar to the measured values in plasma jets [37]. According to several studies, the propagation velocity was smaller inside of the tubes and increased at short distance before the ionization wave reaches the exit [31,[42][43][44] and was 2 to 5 times larger outside from the tube. Increase of the ionization wave velocity at the outlet of the tube is also confirmed by the calculations [13].…”

Section: Propagation Velocity Of Ionization Wavessupporting

confidence: 86%

“…The reported velocities for ionization waves vary in a wide range of 5·10 3 m/s to 4·10 5 m/s [2,[32][33][34][35][36][37][38][39] which covers the velocities obtained in the present study. According to several studies, the propagation velocity was smaller inside of the tubes and increased at short distance before the ionization wave reaches the exit [31,[42][43][44] and was 2 to 5 times larger outside from the tube. In addition, The velocity of about (1.2-1.6) 10 5 m/s corresponds to the calculated electron drift velocity at electric fields of 10-14 kV/cm which are similar to the measured values in plasma jets [37].…”

Section: Propagation Velocity Of Ionization Wavesmentioning

confidence: 99%

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Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Talviste

Jõgi

Raud

et al. 2016

Contrib. Plasma Phys.

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Present study investigated the development of ionization waves in an atmospheric-pressure plasma jet. Plasma was ignited by 6 kHz sinusoidal voltage applied to a cylindrical electrode surrounding the 500 μm inner diameter quartz tube and positioned 10 mm upstream from the tube orifice. The plasma current was observed using a plane electrode placed 20 mm downstream from the tube orifice. The spatial development of ionization waves was monitored by registering the optical emission along the axis of the tube. At voltages in range of 5.5 -7.5 kV only one pulse occurred during positive half-period while at higher voltages the number of pulses increased up to 6 -7 per half-period. The development of the first and subsequent pulses during one half-period was essentially different. For the first pulse the sharp rise of optical emission characterizing the front of the ionization wave occurred initially near the high-voltage electrode and moved towards the tube orifice and further in the He jet. The propagation of ionization wave coincided with the rise of the displacement current measured at the plane electrode. For subsequent ionization waves of the same half-period, the emission occurred initially at the tube orifice and the ionization wave developed simultaneously in two directions: towards the high-voltage electrode and towards the end of the jet. The velocity of ionization wave inside the tube was in range of (2. 5 -5.0)·10 4 m/s for first wave and as high as 1.2·10 5 m/s for subsequent waves.

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Section: Propagation Velocity Of Ionization Wavessupporting

confidence: 86%

Section: Propagation Velocity Of Ionization Wavesmentioning

confidence: 99%

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Talviste

Jõgi

Raud

et al. 2016

Contrib. Plasma Phys.

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“…In other words, both upstream bullet and downstream one accelerate first and then decelerate with increasing the distance away from the rod end. The bullet behavior is similar to that stated by Shi et al and Xian et al In addition, the argon flow velocity is about 9.4 m · s −1 at the tube opening, which is at least three orders of magnitude lower than the bullet velocity. This suggests that the plume is driven by the electric field rather than the gas flow …”

Section: Resultssupporting

confidence: 86%

“…It is noteworthy that the flow channel is composed of the mixed gases (argon and air) for the downstream region, while only pure argon for the upstream region. The existence of oxygen in air can decrease the conductivity of the dark channel behind the bullet head . Consequently, the downstream bullet appears much smaller than the upstream one, as shown in Figure (a).…”

Section: Resultsmentioning

confidence: 97%

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Dynamics of Atmospheric Pressure Plasma Plumes in the Downstream and Upstream Regions

Zhang

Jia

et al. 2016

Plasma Processes & Polymers

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A novel plasma jet driven by an alternating current voltage is developed to generate atmospheric pressure non-equilibrium plasma plumes in the downstream region and in the upstream one of the argon flow. The angle between the rod electrode and the gas flow can be changed easily, and the plume lengths in the downstream and upstream regions are investigated as a function of the angle and the peak voltage. With increasing the peak voltage, the discharge pulse number tends to increase for every half voltage cycle. Using an intensified charge-coupled device camera, the dynamics of the plasma plumes is also investigated in the downstream and upstream regions. The dynamics of the plumes is qualitatively explained by the streamer propagations influenced by residual charges.

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Discharge aspects of a snake‐like plasma plume generated by an atmospheric pressure plasma jet with variable argon flow rate

Ran

et al. 2023

Plasma Processes & Polymers

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Plasma plume morphology, related to streamer behavior and active‐species distribution of plasma jets, is important for fixed‐point and precise treatment of workpieces. For a peculiar snake‐like plume, discharge aspects are investigated with varying argon flow rate (Q) in this paper. Results indicate that the plume length and distance between two neighboring peaks of the snake‐like plume increase with increasing Q. Fast photography indicates that the snake‐like plume is composed of positive streamers propagating along a reproducible serpentine trajectory, which occurs once per voltage cycle. Based on optical emission spectroscopy, electron temperature, electron density, and vibrational temperature are investigated with varying Q. All these phenomena are qualitatively analyzed finally.

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Feather-like He plasma plumes in surrounding N2 gas

Cited by 26 publications

References 32 publications

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Dynamics of Atmospheric Pressure Plasma Plumes in the Downstream and Upstream Regions

Discharge aspects of a snake‐like plasma plume generated by an atmospheric pressure plasma jet with variable argon flow rate

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