On the velocity variation in atmospheric pressure plasma plumes driven by positive and negative pulses

Xiong, Zheng; Lü, Xin; Xian, Yuezhong; Jiang, Zuowen; Pan, Yuan

doi:10.1063/1.3511448

Cited by 72 publications

(62 citation statements)

References 53 publications

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Section: Propagation Velocity Of Ionization Wavessupporting

confidence: 83%

“…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 Wavessupporting

confidence: 83%

“…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. Similarly to our study, the distance covered by the ionization wave was shorter for negative polarity [2,43]. The deceleration of the ionization wave farther in the air was also observed in most of the aforementioned studies and is explained by increasing mixing with air [13,20].…”

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: 83%

Section: Propagation Velocity Of Ionization Wavessupporting

confidence: 83%

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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“…This speed was maintained almost constant (v s ≈ 89 km/s) for about one centimeter, after which the stream slowed down quickly before dissolving, as the applied voltage decreased to a value of about 4 kV. This acceleration has already been observed, and it has been associated with the diffusion of ionized nitrogen molecules in the helium column [28]. This is in agreement with the emission intensity increase of the N 2 and N + 2 lines that we have observed.…”

Section: Plasma Fast Imagingmentioning

confidence: 93%

On the Electrical and Optical Features of the Plasma Coagulation Controller Low Temperature Atmospheric Plasma Jet

Cordaro

Fassina²,

Mancini

et al. 2019

Plasma

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We report on the electrical and optical characterization of the Plasma Coagulation Controller (PCC) device, a low temperature atmospheric plasma source for biomedical applications. This device, designed for the study of plasma-induced blood coagulation, has been developed to operate flexibly in several operational conditions, since it is possible to vary the applied voltage V p and the pulse repetition rate f in a quite wide range ( V p range: 2–12 kV, f range: 1–40 kHz). Emission spectroscopy measurements were conducted by varying the line of sight along the axis of helium and neon plasma plumes. The increase of the Reactive Oxygen and Nitrogen Species (RONS) has been observed, as one moves from inside the gas pipe to the outside, as a consequence of the gas mixture with the surrounding air. Furthermore, high-speed photographs of the plasma jet were taken, showing that the plasma is not uniformly distributed in a continuous volumetric region, the plasma being concentrated in localized structures called Pulsed Atmospheric-pressure Plasma Streams (PAPS). The propagation velocities of these objects have been examined, noting that they are not related to the propagation of ion sound waves. Rather, we provide indications that the streamer propagation speed is proportional to the electron drift velocity.

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“…Jiang et al [122] and Xiong et al [123] did comparative studies on the effects of the polarities of the applied voltages on the propagation of the plasma plumes. They found that the plasma plume is much longer when positive pulsed voltages are used.…”

Section: Effect Of Polarity Of the Applied Voltagementioning

confidence: 99%

Modeling of Atmospheric Pressure Plasmas

Wang¹,

Sun²,

Wang³

2013

Low Temperature Plasma Technology

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The electron temperature is much higher than the temperature of the heavy particles in atmospheric pressure nonequilibrium plasmas. Due to the high collision frequency between electrons and heavy particles, the electrons lose their energy in a short period. If molecular gas is presented, the electrons quickly transfer their energy to molecular rotational and vibrational states because the energy levels of the latter can be much lower than that for electrons' excitation and ionization [1][2][3]. This makes it difficult to obtain atmospheric pressure nonequilibrium plasmas with high electron energy. Thus the ionization efficiency in such case is low. Furthermore, when electronegative gases, such as O 2 and SF 6 , are present, electrons could be absorbed by the gas in a timescale of tens of nanoseconds, or even shorter, which makes it even harder to obtain atmospheric pressure nonequilibrium plasma with electronegative gases [4].

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On the velocity variation in atmospheric pressure plasma plumes driven by positive and negative pulses

Cited by 72 publications

References 53 publications

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

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

On the Electrical and Optical Features of the Plasma Coagulation Controller Low Temperature Atmospheric Plasma Jet

Modeling of Atmospheric Pressure Plasmas

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