Effects of corona charging of coating polymer powders on their minimum ignition energies

Choi, Kwangseok; Yamaguma, Mizuki; Kodama, Tsutomu; Suzuki, Toshisada; Joung, J.H.; Nifuku, Masaharu; Takeuchi, Manabu

doi:10.1016/j.jlp.2003.08.007

Cited by 10 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the above discussion, it is reasonable to recognize the voltage corresponding to the initial current of the steady corona as the corona inception voltage V 0 . With the scope of the corona inception current determined, the potential scope of the corona inception voltage could be determined by using equation (3). In this study, ten preset corona inception currents (from 0.1 to 1 µA with a 0.1 µA increment) are chosen to estimate their corona inception voltages and to examine their influence on the estimated inception voltages.…”

Section: 22mentioning

confidence: 99%

“…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%

See 1 more Smart Citation

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

Meng

Zhang

Zhu

2008

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

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.

show abstract

Section: 22mentioning

confidence: 99%

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.

View full text Add to dashboard Cite

show abstract

“…The other type of test involved the MIEs of coating powder charged by a corona discharge. 3) The results obtained were interesting and significant. However, it remains to be determined whether the MIE of coating powder depends on the magnitude of the corona discharge.…”

mentioning

confidence: 90%

“…By repulsion of electrical forces exerted among powder particles, the charging of powder by corona discharges enhanced the dust dispersion. 3) The improved dispersion due to corona discharges seemed to have an effect on the ignitability. As to the ignition phenomena of dust, a rise in the temperature of particles is initiated by discharge, and, subsequently, a selfheating reaction of particles starts and forms a kernel for flame propagation, leading to ignition.…”

mentioning

confidence: 99%