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Influence of helium mole fraction distribution on the properties of cold atmospheric pressure helium plasma jets
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10.1063/1.4746700
/content/aip/journal/jap/112/3/10.1063/1.4746700
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4746700
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental set up used to generate helium plasma jet propagation in helium-air mixture by pulsed voltage of microsecond width.

Image of FIG. 2.
FIG. 2.

Schematic of the computational domain (a) and the mesh in the axial plane (b).

Image of FIG. 3.
FIG. 3.

Photographs of the plasma jet at a helium flow rate of 1SLM (a), 2 SLM (b), and 3 SLM (c) with a jet diameter of 5 mm for 8 kV applied voltage, 5 μs pulsed width and 1.5 kHz frequency and the helium distribution in the axial plane at the helium outlet velocity of 0.85 m/s (a), 1.70 m/s (b), and 2.55 m/s (c). The white lines are the contour of helium mole fraction obtained by numerical simulation.

Image of FIG. 4.
FIG. 4.

Centerline helium mole fraction decay at variable helium outlet velocity of 0.85 m/s, 1.70 m/s, and 2.55 m/s, corresponding to a helium flow rate of respective 1 SLM, 2 SLM, and 3 SLM. A, B, and C are the locations of the tip of plasma jet in respective Figures 1(a)–1(c).

Image of FIG. 5.
FIG. 5.

Radial profiles of helium mole fraction at different axial heights of Y = 10 mm, Y = 20 mm, and Y = 40 mm; d1, d2, and d3 are the diameters of the plasma at Y = 10 mm, Y = 20 mm, and Y = 40 mm cross-sectional planes, respectively.

Image of FIG. 6.
FIG. 6.

Photograph of the plasma jet under turbulent flow at the helium flow rate of 10 SLM with a jet diameter of 5 mm, corresponding to a helium outlet velocity of 8.47 m/s (a). And the helium mole faction distribution in the axial plane with time evolution of t = 135 ms (b), t = 195 ms (c) and t = 240 ms (d). At t = 0 ms helium starts to come out of the jet outlet.

Image of FIG. 7.
FIG. 7.

The helium mole fraction distribution along the centerline for a helium outlet velocity of 8.47 m/s with time evolution.

Image of FIG. 8.
FIG. 8.

The photograph of the plasma jet in completely turbulent regime for a helium flow rate of 20 SLM with a jet diameter of 5 mm, corresponding to a helium outlet velocity of 16.94 m/s (a). And the helium mole faction distribution in the axial plane at t = 63 ms (b) and t = 69 ms (c). At t = 0 ms, helium starts to come out of the jet outlet.

Image of FIG. 9.
FIG. 9.

The helium mole fraction distribution along the centerline at the helium outlet velocity of 16.94 m/s with time evolution.

Image of FIG. 10.
FIG. 10.

Plasma jet length (L) versus helium average velocity (V) for variable jet diameters of 0.6 mm, 1.8 mm, and 5.0 mm for a constant 8 kV applied voltage, 5 μs pulsed width, and 1.5 kHz frequency.

Image of FIG. 11.
FIG. 11.

Dimensionless plasma jet length (l) as a function of jet Reynolds number (Re) for different jet diameters.

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/content/aip/journal/jap/112/3/10.1063/1.4746700
2012-08-14
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of helium mole fraction distribution on the properties of cold atmospheric pressure helium plasma jets
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4746700
10.1063/1.4746700
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