Flush probe studies of plasma flow over a flat plate: theory

Giles, C.R.; Clements, R. M.; Smy, P. R.

doi:10.1088/0022-3727/12/10/010

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…The first one is the 'one-sided probe' when one side of the planar probe is insulated. Such probes are used extensively for the diagnostics of the flowing plasma [13,14] and for the diagnostics of electron distribution function anisotropy [15]. The 2D simulation of such one-sided probes in the collisionless regime of ion motion was performed by Stamate [16,17] for a broad range of discharge regimes and types of ions.…”

Section: Introductionmentioning

confidence: 99%

The plasma sheath around planar probes: effects of ion collisions

Voloshin

Рахимова

Mankelevich

2016

Plasma Sources Sci. Technol.

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The 2D numerical model of the ion current collection by a planar probe has been developed on the basis of a particle in cell with the Monte Carlo collision method for ion motion. This model is used to reveal the effects of ion collisions on the probe sheath area and spatial distribution of plasma density and to warn against current-voltage probe characteristic misinterpretation at plasma density measurements by commonly used Langmuir probe methods.

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Section: Introductionmentioning

confidence: 99%

The plasma sheath around planar probes: effects of ion collisions

Voloshin

Рахимова

Mankelevich

2016

Plasma Sources Sci. Technol.

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“…A signal-averaging digital oscilloscope was used for noise rejection and the ion current relaxation time was determined by data analysis on a PDP 11/10 minicomputer. Details of this analysis can be found elsewhere (Giles 1978).…”

Section: Methodsmentioning

confidence: 99%

“…In a previous theoretical paper (Giles et al 1979) we have shown that the transient response of probe current to a negative step function yields information about the flow velocity in the vicinity of the probe. By varying the thickness of the DC ion sheath surrounding the probe it would in principle be possible to map the velocity profile through the hydrodynamic and thermal boundary layers.…”

Section: Introductionmentioning

confidence: 98%

Flush probe studies of plasma flow over a flat plate: experimental

Giles¹,

Clements²,

Smy³

1980

J. Phys. D: Appl. Phys.

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In an earlier paper (see ibid., vol.12, p.1685 (1979)) the authors developed two theoretical models which describe the DC and transient characteristics of a planar conductor immersed in a flowing plasma. The authors describe experiments which test this theory. Both low and high ion densities are used to study the respective cases of the ion sheath edge being far from the planar conductor and the ion sheath being inside the viscous boundary layer. Ion current to flush probes embedded in the conductor and to spherical probes near the conductor is used to verify the plasma behaviour predicted earlier.

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Droplet motion in an electrohydrodynamic fine spray

Grace

Dunn

1996

Experiments in Fluids

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The results of a combined experimental and numerical study on droplet behavior within an electrohydrodynamic fine spray are presented. The fine spray exists in the transition region between the multiple cone-jet and rim emission spray modes. Experiments were conducted specifically to characterize the motion of droplets within the spray. Light-sheet visualizations and measurements of droplet speed and velocity using laser-based, single-particle counters were obtained. Additionally, a numerical simulation of the droplet motion within the spray was made.and compared to the experimental results. The electrohydrodynamic fine spray of ethanol droplets ( ~ 1 to 40 pm diameter) was generated using a typical capillary-plate configuration, with a capillary tip electric field intensity of ~ 106 V/m and a spray charge density of ~ 70 C/m 3. Acquired images of the spray revealed a zone of rapid expansion near the capillary followed by a more gradual expansion farther from the capillary. In situ laser-diagnostic measurements confirmed these observations. Measured droplet speeds decreased rapidly with increasing axial distance from the capillary, but then increased beyond the spray's axial mid-plane as a result of a change in the sign of the axial internal electric field. Droplet axial velocity components behaved similarly. The radial velocity components exhibited a maximum value off of the spray's centerline in the nearcapillary region. Farther away from the capillary, they increased monotonically with increasing radial position. These trends identified the significant role that the radial internal electric field plays in spray expansion. The numerical simulation of the normal spray verified the inferred change in sign of the axial internal field and underscored the dominant contribution of the external electric field in the near-capillary region and of the internal electric field farther away.

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Flush probe studies of plasma flow over a flat plate: theory

Cited by 5 publications

References 16 publications

The plasma sheath around planar probes: effects of ion collisions

The plasma sheath around planar probes: effects of ion collisions

Flush probe studies of plasma flow over a flat plate: experimental

Droplet motion in an electrohydrodynamic fine spray

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