Corona Wind-Augmented Natural Convection--Part 1: Single Electrode Studies

Bhattacharyya, Souvik; Peterson, A.C.

doi:10.1080/10655130216025

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…Studies of corona discharges with point-to-plane electrode geometry started at the end of the 19th century by Röntgen, as referred to by Ferreira et al [1]. Nowadays corona discharge is being involved in a number of commercial and industrial applications, such as manufacture of ozone, surface treatment, photocopying, electrostatic precipitation, destruction of toxic compounds and electrostatic powder coating [1][2][3][4][5][6][7]. All these applications, however, require reduction of the production cost and optimization of the configuration and operation conditions.…”

Section: Introductionmentioning

confidence: 99%

A general empirical formula of current–voltage characteristics for point-to-plane geometry corona discharges

Meng

Zhang

Zhu

2008

J. Phys. D: Appl. Phys.

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With a point-to-plane geometry, the experimental investigation of the current–voltage characteristics in corona discharges demonstrated that existing empirical formulae met with some physical difficulties in explaining the results. By mathematically processing the experimental data and applying the updated knowledge of corona inception, a new general formula in characterizing the relationship of corona current–voltage was derived and expressed as I = K(V − V0)n. It was demonstrated that the exponent n falls into a limited scope of 1.5–2.0, and there always exists an optimal exponent n in the scope, which can be determined by maximizing the R-square of regression. Of all the potentially influential factors, it was disclosed that the point radius has the strongest influence on the optimal exponent n, and the effects of ambient conditions and corona polarities are not noticeable. The optimal exponent n holds a fixed value of 2.0 for microscopic points and of 1.5 for large points with a radius in millimetres, but changes decreasingly with the radius for the points of microns. For given experimental conditions, the optimal exponent n almost does not change with the inter-electrode distance. Furthermore, it was demonstrated that the formula is applicable not only for both negative and positive coronas in point-to-plane geometries but also for both polarities in point-to-ring geometries. With the optimal exponent n, the formula can well explain the inconsistencies met by other existing formulae and best represent the characteristics of corona current–voltage with an accuracy of 1 µm.

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Section: Introductionmentioning

confidence: 99%

A general empirical formula of current–voltage characteristics for point-to-plane geometry corona discharges

Meng

Zhang

Zhu

2008

J. Phys. D: Appl. Phys.

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“…Bhattacharyya and Peterson [10,11] worked on novel flow visualization and extensive and controlled heat transfer enhancement. The studies were conducted to help understand and characterize the corona wind-augmented natural convection process from a vertical copper plate subject to a reversible-polarity DC high-voltage electric field at various constant heating fluxes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Natural Convection in Inclined Channel in Presence of Electrostatic Field

Shabahangnia

Nasirivatan

Jafari

et al. 2014

Experimental Heat Transfer

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The influence of external electrohydrodynamic forces on natural convection from a flat plate has been studied. Temperature distribution in the aforementioned channel at a 5 458, 908, and 1508 angles in different 10-, 12-, and 15-kV electrostatic fields has been reviewed. Corona wind and the shape of the created vortex by electrohydrodynamics were detected. The results showed that heat transfer was enhanced by increasing the electrostatic field in all angles. In the presence of the field, enhancement of heat transfer of the plate at acute angles is better than for obtuse ones. The optimal angle in terms of heat transfer was 458, noting heat transfer improvement by 61%.

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“…One other by-product of electrical coronas is the corona wind [6]. Ions produced in electrical coronas drift in the low-field region and collide with neutral species via elastic collisions.…”

Section: Introductionmentioning

confidence: 99%

A comparative assessment of two optical fibre techniques for measuring the speed of the electric wind in a negative polarity, atmospheric corona discharge

Lamb¹,

Hooper²

2006

Meas. Sci. Technol.

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Two optical fibre anemometers, one based on a Mach–Zehnder interferometer (OFIA) and another a novel laser-optical fibre Bragg grating sensor (FBGA) have been constructed to measure the speed of the convective air flow generated in the point-plane gap of a negative corona discharge in atmospheric air. In both configurations the sensing section of the optical fibre anemometers is subjected to controlled, repetitive bursts of infrared radiation from a CO2 laser and the combination of localized heating and convective cooling by the corona wind results in an optical signal that is directly calibrated to the speed of the wind. Both the OFIA and FBGA successfully measured the speed of the corona wind in the discharge gap, with wind speeds ranging from 0 to 0.7 m s−1 observed at different locations in the discharge gap. However, the FBGA, due primarily to the ability to average sensor response over many measurements, exhibited an order of magnitude higher sensitivity than the OFIA (Δv ≈ 4 × 10−3 m s−1 compared to 3 × 10−2 m s−1). Both sensors yielded measurements of wind speed that were an order of magnitude lower than similar measurements using laser Doppler anemometry (LDA), indicating that the seed particles introduced as part of the LDA system are providing false reading of wind speed due to acceleration by the gap electric field.

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Corona Wind-Augmented Natural Convection--Part 1: Single Electrode Studies

Cited by 14 publications

References 4 publications

A general empirical formula of current–voltage characteristics for point-to-plane geometry corona discharges

A general empirical formula of current–voltage characteristics for point-to-plane geometry corona discharges

Experimental Investigation of Natural Convection in Inclined Channel in Presence of Electrostatic Field

A comparative assessment of two optical fibre techniques for measuring the speed of the electric wind in a negative polarity, atmospheric corona discharge

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