A1 Refereed original research article in a scientific journal
Electrostatic measurements on a miniaturized fluidized bed
Authors: Murtomaa M, Rasanen E, Rantanen J, Bailey A, Laine E, Mannermaa JP, Yliruusi J
Publisher: ELSEVIER SCIENCE BV
Publication year: 2003
Journal:: Journal of Electrostatics
Journal name in source: JOURNAL OF ELECTROSTATICS
Journal acronym: J ELECTROSTAT
Article number: PII S0304-3886(02)00121-3
Volume: 57
Issue: 1
First page : 91
Last page: 106
Number of pages: 16
ISSN: 0304-3886
DOI: https://doi.org/10.1016/S0304-3886(02)00121-3
Abstract
In the pharmaceutical industry fluidization is often used in drying, coating and granulation processes. During fluidization powder particles contact other particles as well as the walls of the vessel and this leads to generation of electric charges. These charges may result in sparks, dust explosions, fires, reduced process efficiency and particle accumulation on the walls. However, the mechanism of the charging is not well understood. In this paper, an inductive method for charge generation measurement is presented. The system consists of an electrostatic ring probe, which allows charge scanning across the miniaturized fluidized bed without disturbing the fluidization process. The charge coupling from the system to the probe has been modelled and the experimental data have been simulated using an advanced field solving software. Experiments on lactose monohydrate, microcrystalline cellulose and glass beads have been performed and these results are presented. (C) 2002 Elsevier Science B.V. All rights reserved.
In the pharmaceutical industry fluidization is often used in drying, coating and granulation processes. During fluidization powder particles contact other particles as well as the walls of the vessel and this leads to generation of electric charges. These charges may result in sparks, dust explosions, fires, reduced process efficiency and particle accumulation on the walls. However, the mechanism of the charging is not well understood. In this paper, an inductive method for charge generation measurement is presented. The system consists of an electrostatic ring probe, which allows charge scanning across the miniaturized fluidized bed without disturbing the fluidization process. The charge coupling from the system to the probe has been modelled and the experimental data have been simulated using an advanced field solving software. Experiments on lactose monohydrate, microcrystalline cellulose and glass beads have been performed and these results are presented. (C) 2002 Elsevier Science B.V. All rights reserved.
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