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Combined effect of moisture and electrostatic charges on powder flow
Rescaglio, A.; Schockmel, Julien; Vandewalle, Nicolas et al.
2017In EPJ Web of Conferences, 140
Peer reviewed
 

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Abstract :
[en] It is well known in industrial applications involving powders and granular materials that the relative air humidity and the presence of electrostatic charges influence drastically the material flowing properties. The relative air humidity induces the formation of capillary bridges and modify the grain surface conductivity. The presence of capillary bridges produces cohesive forces. On the other hand, the apparition of electrostatic charges due to the triboelectric effect at the contacts between the grains and at the contacts between the grains and the container produces electrostatic forces. Therefore, in many cases, the powder cohesiveness is the result of the interplay between capillary and electrostatic forces. Unfortunately, the triboelectric effect is still poorly understood, in particular inside a granular material. Moreover, reproducible electrostatic measurements are difficult to perform. We developed an experimental device to measures the ability of a powder to charge electrostatically during a flow in contact with a selected material. Both electrostatic and flow measurements have been performed in different hygrometric conditions. The correlation between the powder electrostatic properties, the hygrometry and the flowing behavior are analyzed. © The Authors, published by EDP Sciences, 2017.
Disciplines :
Physics
Author, co-author :
Rescaglio, A.;  CESAM-GRASP, University of Liége, Belgium
Schockmel, Julien 
Vandewalle, Nicolas  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Lumay, Geoffroy ;  Université de Liège - ULiège > Département de physique > Physique expér. de la matière molle et des syst. complexes
Radjai, F.
Delenne, J. Y.
Nezamabadi, S.
Radjai, F.
Luding, S.
Language :
English
Title :
Combined effect of moisture and electrostatic charges on powder flow
Publication date :
2017
Event name :
8th International Conference on Micromechanics on Granular Media, Powders and Grains 2017
Event date :
3 July 2017 through 7 July 2017
Audience :
International
Journal title :
EPJ Web of Conferences
ISSN :
2101-6275
eISSN :
2100-014X
Publisher :
EDP Sciences
Volume :
140
Peer reviewed :
Peer reviewed
Commentary :
128607
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