Paraxial corona discharge. I. Review, instrumentation and experiments

Bouziane, A.; Hidaka, Kunihiko; Jones, James E.; Rowlands, Alun; Taplamacıoğlu, M. Cengiz; Waters, R. T.

doi:10.1049/ip-smt:19949930

Cited by 5 publications

(5 citation statements)

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“…The distorting effect of the space charge on the field patterns of the present configuration is evident for the different cases considered as seen in Figure 9. These findings are consistent with the conclusions arrived at earlier [21,29,30], where it was reported that the use of Deutsch's assumption in the corona analysis is quite questionable and it may lead to significant inaccuracies in the paths along which ions flow from the wire to the collecting electrode.…”

Section: Discussionsupporting

confidence: 92%

Experimental and numerical investigations of the corona characteristics of a new Tri-electrode system for electrostatic separation processes

Abouelsaad

Abouelatta

Salama

2014

Eur. Phys. J. Appl. Phys.

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The paper presents the measurement and computation of the corona onset voltages, electric field and ion current density profiles of a new "Tri-electrode system" intended for electrostatic separation applications. Unlike the well-known "dual cylinder-wire electrode system", the new system utilizes an extra adjustable wire in order to provide the means for a more efficient ion charging current; necessary for separation of different granular mixtures. An experimental setup is constructed to model the present multi-electrode arrangement. The measurements are carried out for wire diameters between 0.3-1.0 µm and for different geometrical parameters. Without resorting to the commonly used Deutch's assumption, a computational scheme is developed to solve the corona equations and to compute the associated ionized field quantities of the system. Mapping of the ion flow field patterns demonstrates the impact of this assumption on the solution's accuracy. The computed results were found to be in good agreement with experiments. The configuration offers a more efficient charging process and separation in comparison with earlier separators' designs.

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Section: Discussionsupporting

confidence: 92%

Experimental and numerical investigations of the corona characteristics of a new Tri-electrode system for electrostatic separation processes

Abouelsaad

Abouelatta

Salama

2014

Eur. Phys. J. Appl. Phys.

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“…The current-density variations were symmetrical about the 0 • and 180 • positions and became sharper with increasing wire separation. The curves are of similar general form to those for the line-to-plane and the singlewire paraxial cylinder geometries [10]. Just like for the paraxial system, (J /J max ) profiles were found to be independent of the applied voltage.…”

Section: Corona Current-density Profilessupporting

confidence: 59%

“…The I -V curve is very close to that of a single wire in a paraxial system with axial displacement = 7.5 mm. However, for larger wire separation ( = 30 mm) the system acts as two independent single wires since the proximity effect is small and the total corona current is almost double that of the corresponding paraxial system [10]. Just like in the co-axial and paraxial system configurations, the corona current per unit length for the twin-wire configuration is related to the applied voltage by a square law.…”

Section: Current-voltage (I-v ) Characteristicsmentioning

confidence: 99%

“…The system configuration is shown in figure 1. The radius R of the metallic outer cylinder was 50 mm as used in earlier co-axial and paraxial systems for single wires [4]. The current density (J ) and electric field profiles (E) were measured at the outer cylinder as a function of the angular coordinate θ for various wire separations.…”

Section: The Twin-wire Geometrymentioning

confidence: 99%

“…The experimental system for tests with single paraxial wires has previously been described in detail [4]. The axial displacements of the present twin wires were regulated by two identical brass discs which had been mounted on insulating supports.…”

Section: The Experimental Arrangementmentioning

confidence: 99%

See 2 more Smart Citations

Non-Laplacian ion trajectories in mutually interacting corona discharges

Bouziane

Taplamacioglu

Hidaka

et al. 1997

J. Phys. D: Appl. Phys.

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Ion drift in a single-source corona discharge occurs along trajectories which deviate relatively little from the Laplacian field direction. This allows the Deutsch approximation to be used with low errors as in the Popkov model. For coronas from more than one source, the interaction of the space-charge electric fields can cause significant trajectory distortion. Measurements of positive coronas from twin- wire systems make it possible to quantify the Deutsch error. A charge expansion model is used to calculate the ion trajectories at the corona boundaries. The Popkov model predicts, in agreement with measurements, that the normalization of the current density and electric field profiles with respect to the maximum values ( and ) yields unique curves independent of the magnitude of the applied voltage. However, the shapes of the profiles of current density and electric field for small wire displacements give poor simulations because of the effect of the proximity of the interacting coronas. In practice this would lead to failure of the Kaptsov condition at the wire surface. The charge expansion model avoids the difficulties of the Popkov model's assumptions. A finite-difference procedure of the charge-expansion model has been outlined and applied to the position of maximum current density where the ion path is known. This confirms the failure of the Kaptsov approximation of the field at the corona conductor. Application of the charge-expansion model to the position of minimum current density has been also possible in order to estimate the drift path length. This trajectory is non-Laplacian in shape and the results indicate that, along this path, a position of minimum field is encountered rather than the monotonic field found at .

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Measurements of current and electric field distributions beneath a positive DC wire-to-plane corona using a linear biased probe

Zebboudj

2000

IEE Proceedings - Science, Measurement and Technology

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Paraxial corona discharge. I. Review, instrumentation and experiments

Cited by 5 publications

References 0 publications

Experimental and numerical investigations of the corona characteristics of a new Tri-electrode system for electrostatic separation processes

Experimental and numerical investigations of the corona characteristics of a new Tri-electrode system for electrostatic separation processes

Non-Laplacian ion trajectories in mutually interacting corona discharges

Measurements of current and electric field distributions beneath a positive DC wire-to-plane corona using a linear biased probe

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