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Mostrando ítems 1-10 de 23
Artículo
Correlation between bulk stresses and interparticle contact forces in fine powders
(American Physical Society, 2001)
We present measurements of the tensile strength as a function of the consolidation stress for a set of fine cohesive powders ~xerographic toners! of 12.7 mm particle size and with a range of concentration of submicron fumed ...
Artículo
The settling of fine cohesive powders
(IOP Publishing Ltd., 2001-05-01)
We investigate the settling of an initially fluidized bed of a fine cohesive powder. Experimental results on the sedimentation rate cannot be fitted by theoretical and empirical equations existing in the literature and ...
Artículo
Pull-off force of coated fine powders under small consolidation
(American Physical Society, 2009)
In this paper, a three-dimensional model taking into account the contact deformation and surface area coverage (SAC) of nanoadditives is proposed to predict the force required to separate two contacting particles (the ...
Artículo
Granular avalanches: Deterministic, correlated and decorrelated dynamics
(IOP Publishing Ltd., 2004-12-15)
A statistical analysis of granular avalanches in a half-filled and slowly rotated drum is presented. For large-sized grains the classical coherent oscillation is reproduced, i.e. we observe a quasi-periodic succession of ...
Artículo
Fine cohesive powders in rotating drums: Transition from rigid-plastic flow to gas-fluidized regime
(American Physical Society, 2002)
We investigate the dynamics of fine cohesive powders inside rotating drums. We show that these powders may be fluidized due to entrapment of ambient gas, and we determine the onset of fluidization. Experimental measurements ...
Artículo
Aggregation and sedimentation in gas-fluidized beds of cohesive powders
(American Physical Society, 2001)
We present measurements on the settling velocity of gas-fluidized beds of fine cohesive powders. In the solidlike regime ~solid volume fraction f.fc) particles are static, sustained by enduring contacts. The settling is ...
Artículo
Rheology of magnetofluidized fine powders
(2010)
Usually a bed of solid particles °uidized by a gas is inherently unstable. Gas bubbles are rapidly formed at the onset of °uidization, which hinders the e±ciency of gas-solid contact. In the case of magnetizable particles, ...
Artículo
Jamming Threshold of Dry Fine Powders
(American Physical Society, 2004)
We report a novel experimental study on the jamming transition of dry fine powders with controlled attractive energy and particle size. Like in attractive colloids dry fine particles experience diffusionlimited clustering ...
Artículo
Looking for Self-Organized Critical Behavior in Avalanches of Slightly Cohesive Powders
(American Physical Society, 2001)
We report results from a statistical analysis of avalanches of cohesive powders in a slowly rotated drum. Interparticle adhesion, which diminishes the effect of inertia and whose magnitude strongly fluctuates in a local ...
Artículo
Electromechanics of fluidized beds of nanoparticles
(American Physical Society, 2009)
The electromechanical behavior of a gas-fluidized bed of insulating silica nanoparticles is investigated. When fluidized by gas, these nanoparticles form highly porous agglomerates of size of the order of hundreds of ...