Article (Scientific journals)
Measuring the flowing properties of powders and grains
Lumay, Geoffroy; Boschini, Frédéric; Traina, Karl et al.
2012In Powder Technology, 224, p. 19
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Keywords :
Powder characterization; Flowability; Powder rheometer
Abstract :
[en] A granular material is a complex system which exhibits non-trivial transitions between the static, the quasi-static and the dynamical states. Indeed, an assembly of grains can behave like a solid or a fluid according to the applied stress. In between solid and fluid granular states, very slow dynamics are observed. When a complete macroscopic characterization of a powder is needed, all these granular states have to be precisely analyzed. In this paper, we show how three measurement techniques can be used to measure the physical properties of a powder. The measurements are based on classical tests modified to meet the recent fundamental researches on granular materials. The static properties of the powder are analyzed through the shape of a heap. The quasi-static behavior is studied with the analysis of the compaction dynamics. Finally, the dynamical regime is monitored through the flow in a rotating drum. In order to illustrate how these measurements can be used in practical cases, analyses are performed with three types of granular materials: silicon carbide abrasives, flours and rice. These selected materials allow to show the influence of the different parameters (grain size, grain size distribution, grain shape) on the macroscopic properties of the assembly. Moreover, these studies show the pertinence of the parameters obtained with the proposed techniques for the rheological characterization of powders and grains.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Lumay, Geoffroy ;  Université de Liège - ULiège > Département de physique > Physique statistique
Boschini, Frédéric ;  Université de Liège - ULiège > Département de chimie (sciences) > Plateforme APTIS
Traina, Karl 
Bontempi, Sébastien ;  Université de Liège - ULiège > Département de physique > Physique statistique
remy, Jean Claude
Cloots, Rudi ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Vandewalle, Nicolas  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Language :
English
Title :
Measuring the flowing properties of powders and grains
Publication date :
July 2012
Journal title :
Powder Technology
ISSN :
0032-5910
eISSN :
1873-328X
Publisher :
Elsevier Science, Lausanne, Switzerland
Volume :
224
Pages :
19
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 May 2012

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