Electric probe investigations of microwave generated, atmospheric pressure, plasma jets

Porteanu, Horia‐Eugen; Kühn, Silvio; Gesche, Roland

doi:10.1063/1.3448034

Cited by 18 publications

(13 citation statements)

References 29 publications

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“…For atmospheric dry helium plasmas, the mean electron temperature is reported to be about 1 -5 eV [69] [70]. Therefore T 13 of 7,988 -8,265 K in Fig.…”

Section: Plasma Temperatures and Electron Densitymentioning

confidence: 90%

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Liu¹,

Kong²

2011

J. Phys. D: Appl. Phys.

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To cite this version:J J Liu, M G Kong. Sub-60°C atmospheric heliumwater plasma jets: modes, electron heating and downstream reaction chemistry. Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (34) AbstractFor plasma treatment of many heat labile materials (e.g. living tissues) that are either moist or contain a surface layer of liquid, it is desirable that the gas plasma is generated at atmospheric pressure for process convenience and with a gas temperature ideally no more than 60 o C for mitigating permanent damage to the integrity of the test material. This implies that the liquid-containing plasma needs to be of low energy and that plasma treatment should be based largely on non-equilibrium reaction chemistry. In this contribution, a class of sub-60 o C atmospheric helium-water plasma jets is studied in terms of their main physiochemical properties. It is shown that there are five distinct modes appearing in the sequence of, with increasing voltage, the first chaotic mode, the plasma bullet mode, the second chaotic mode, the abnormal glow mode, and the nonthermal arc mode. Its chaotic modes may be sustained over a wide range of water vapour concentration (0 -2,500ppm). Compared to other liquid-containing plasmas, the He-H 2 O plasma jet operated below its nonthermal arc mode has several distinct advantages, namely very low energy consumption (2 -10 J per pulse), sub-60 o C gas temperature,

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“…For atmospheric dry helium plasmas, the mean electron temperature is reported to be about 1 -5 eV [69] [70]. Therefore T 13 of 7,988 -8,265 K in Fig.…”

Section: Plasma Temperatures and Electron Densitymentioning

confidence: 90%

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Liu¹,

Kong²

2011

J. Phys. D: Appl. Phys.

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“…The asymmetry of the double probe characteristic (figure 3a) depends on the length of the plasma column (absorbed microwave power, gas flow). The probe characteristics obtained are subjected to a smoothing procedure by a Savitzky-Golay filter (figure 3b) and three-point differentiation [5] for calculation of the first derivative of the current with respect to the applied voltage. The theoretical model [6] of this discharge show that the EEDF is close to Maxwellian at our experimental conditions.…”

Section: Evaluation Procedures and Resultsmentioning

confidence: 99%

“…The results obtained for the plasma density value are in a wide range; we compared them with results from optical emission spectroscopy. The single probe at recombination regime [5] can also be applied for determining the plasma parameters in a microwave atmospheric plasma jet if a reference electrode is available.…”

Section: Introductionmentioning

confidence: 99%

Plasma parameters of a small microwave discharge at atmospheric pressure obtained by probe diagnostics

Kiss’ovski¹,

Ivanov²,

Kolev³

2012

J. Phys.: Conf. Ser.

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“…If the electron mean-free-path for elastic collisions in a gas of neutral particles, λ ea , is larger than y B , the electron flux to the probe can be evaluated using the electron density at the outer border of that near-wall layer, where they follow the Boltzmann distribution. Therefore, under such plasma conditions the electron current collected by the probe obeys the simple exponential relationship 19,[23][24][25][28][29][30][31] …”

Section: Double Floating Probe In High-pressure Highly Ionized mentioning

confidence: 99%

On the use of the double floating probe method to infer the difference between the electron and the heavy particles temperatures in an atmospheric pressure, vortex-stabilized nitrogen plasma jet

Prevosto

Kelly

Mancinelli

2014

Review of Scientific Instruments

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Sweeping double probe measurements in an atmospheric pressure direct current vortex-stabilized plasma jet are reported (plasma conditions: 100 A discharge current, N2 gas flow rate of 25 Nl/min, thoriated tungsten rod-type cathode, copper anode with 5 mm inner diameter). The interpretation of the double probe characteristic was based on a generalization of the standard double floating probe formulae for non-uniform plasmas coupled to a non-equilibrium plasma composition model. Perturbations caused by the current to the probe together with collisional and thermal processes inside the probe perturbed region were taken into account. Radial values of the average electron and heavy particle temperatures as well as the electron density were obtained. The calculation of the temperature values did not require any specific assumption about a temperature relationship between different particle species. An electron temperature of 10,900 ± 900 K, a heavy particle temperature of 9300 ± 900 K, and an electron density of about 3.5 × 10(22) m(-3) were found at the jet centre at 3.5 mm downstream from the torch exit. Large deviations from kinetic equilibrium were found toward the outer border of the plasma jet. These results showed good agreement with those previously reported by the authors by using a single probe technique. The calculations have shown that this method is particularly useful for studying spraying-type plasma torches operated at power levels of about 15 kW.

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Electric probe investigations of microwave generated, atmospheric pressure, plasma jets

Cited by 18 publications

References 29 publications

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Plasma parameters of a small microwave discharge at atmospheric pressure obtained by probe diagnostics

On the use of the double floating probe method to infer the difference between the electron and the heavy particles temperatures in an atmospheric pressure, vortex-stabilized nitrogen plasma jet

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