Compression of monodisperse powder samples in quasistatic conditions is addressed in a pressure range such that particles fragmentation occurs while the solid remains incompressible (typical pressure range of 1–300 MPa for glass powders). For a granular bed made of particles of given size, the existence of three stages is observed during compression and crush up. First, classical compression occurs and the pressure of the granular bed increases along a characteristic curve as the volume decreases. Then, a critical pressure is reached for which fragmentation begins. During the fragmentation process, the granular pressure stays constant in a given volume range. At the end of this second stage, 20%–50% of initial grains are reduced to finer particles, depending on the initial size. Then the compression undergoes the third stage and the pressure increases along another characteristic curve, in the absence of extra fragmentation. The present paper analyses the analogies between the phase transition in liquid-vapour systems and powder compression with crush-up. Fragmentation diagram for a soda lime glass is determined by experimental means. The analogues of the saturation pressure and latent heat of phase change are determined. Two thermodynamic models are then examined to represent the crush-up diagram. The first one uses piecewise functions while the second one is of van der Waals type. Both equations of state relate granular pressure, solid volume fraction, and initial particle diameter. The piecewise functions approach provides reasonable representations of the phase diagram while the van der Waals one fails.
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December 2016
Research Article|
December 01 2016
Phase diagram of crushed powders
Sébastien Bodard;
Sébastien Bodard
a)
1
RS2N
, 371 Chemin de Gaumin, 83640 Saint Zacharie, France
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Olivier Jalbaud;
Olivier Jalbaud
a)
2
Polytech Marseille
, 60 rue Joliot Curie, 13013 Marseille, France
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Richard Saurel
;
Richard Saurel
a)
1
RS2N
, 371 Chemin de Gaumin, 83640 Saint Zacharie, France
3
Aix Marseille Université
, CNRS, Centrale Marseille, M2P2, Marseille, France
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Yves Burtschell;
Yves Burtschell
a)
2
Polytech Marseille
, 60 rue Joliot Curie, 13013 Marseille, France
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Emmanuel Lapebie
a)
Electronic addresses: [email protected]; [email protected]; [email protected]; [email protected]; and [email protected]
Physics of Fluids 28, 123301 (2016)
Article history
Received:
May 23 2016
Accepted:
November 07 2016
Citation
Sébastien Bodard, Olivier Jalbaud, Richard Saurel, Yves Burtschell, Emmanuel Lapebie; Phase diagram of crushed powders. Physics of Fluids 1 December 2016; 28 (12): 123301. https://doi.org/10.1063/1.4968195
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