4. Measurement of electrostatic charge and charge distribution

It is recognized that either the charge distribution or the mass charge of particles plays an important role in their behavior. The presence of bipolar charges can reduce deposition efficiency in electrostatic coating processes. In the powder conveying industry, the presence of bipolar charges leads to fouling and electrostatic discharges, as well as ignition risks. It is therefore essential to have methods for qualifying and/or quantifying the polarity and level of electrostatic charges present within powder particles. This objective can be achieved by various devices described below.

4.1 Faraday cage

The Faraday cage (figure ) is one of the most common devices for measuring powder charge. A Faraday cage consists of two concentric cylinders...

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Bibliography

(1) - TEUNOU (E.), FITZPATRICK (J.-J.) - Effect of storage time and consolidation on food powder flowability. - Journal of Food Engineering, 43, p. 97-101 (2000).
(2) - RUMPF (H.) - Particle technology. - Chapman and Hall (1979).

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SALEH (K.), GUIGON (P.) - Mise en œuvre des poudres. Caractérisation et analyse des propriétés des solides divisés. -

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Standards and norms

Code of practice for Control of undesirable static electricity. Part 2 : Recommendations for particular industrial situations - BS 5958-2 - 1991
Matériels électriques destinés à être utilisés en présence de poussières combustibles. 2e partie : Méthodes d'essai. Section 2 : Méthode de détermination de la résistivité électrique des couches de poussière. Paris La Défense, Union Technique de l'Électricité - CEI 61241-2-2...