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首页> 外文期刊>Granular matter >Compaction of fine powders: from fluidized agglomerates to primary particles
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Compaction of fine powders: from fluidized agglomerates to primary particles

机译：压实细粉：从流化团聚体到初级颗粒

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摘要

In previous works it has been shown that fine powders (particle size 7 μm approx< d_p approx< 20μm) exhibit two well differentiated behaviors in the compaction regime at low consolidation stresses σ_c. At very low stresses (σ_c approx< 10 Pa) the compaction process is governed by a critical-like dynamics of fractal agglomerates previously formed in the fluid-like regime, undergoing a transition from a random loose packed configuration at the jamming transition to a random close packed state. Then agglomerates are disrupted as further pressure is imposed and there is a cross over to a behavior which is ruled by the initial distribution of local voids within the jammed agglomerates that are filled during compaction. In this work we have extended the range of consolidation stresses up to σ_c approx= 0.1 MPa and we have observed a new transition of behavior at σ_c approx= 10kPa. Our measurements indicate that at this level of consolidation agglomerates are fully disrupted. The compaction process is then determined by the rearrangement of primary particles that have lost memory of their initially agglomerated state in fluidization and behave similarly to noncohesive grains.
机译：在以前的工作中已经表明，在低固结应力σ_c的压实状态下，细粉（粒径约7μm约

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