Effects of Interparticle Force on the Packing of Spherical Granular Material

Forsyth, Anthony; Hutton, S. Raymond; Osborne, Charles; Rhodes, Martin

doi:10.1103/physrevlett.87.244301

Cited by 51 publications

(33 citation statements)

References 13 publications

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“…Then, we can compute the Bond number Bo which is the ratio between the cohesive force F c and the grain weight mg. If we assume that the inter-grains force is proportional to the square of the magnetic field [18], we obtain …”

Section: Methodsmentioning

confidence: 99%

Compaction dynamics of a magnetized powder

2009

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We have investigated experimentally the influence of a magnetic interaction between the grains on the compaction dynamics of a granular pile submitted to a series of taps. The granular material used to perform this study is a mixture of metallic and glass grains. The packing is immersed in an homogeneous external magnetic field. The magnetic field induces an interaction between the metallic grains that constitutes the tunable cohesion. The compaction characteristic time and the asymptotic packing fraction have been measured as a function of the Bond number which is the ratio between the cohesive magnetic force and the grain weight. These measurements have been performed for different fractions of metallic beads in the pile. When the pile is only made of metallic grains, the characteristic compaction time increases as the square root of the Bond number. While the asymptotic packing fraction decreases as the inverse of the Bond number. For mixtures, when the fraction of magnetized grains in the pile is increased, the characteristic time increases while the asymptotic packing fraction decreases. A simple mesoscopic model based on the formation of granular chains along the magnetic field direction is proposed to explain the observed macroscopic properties of the packings.

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Section: Methodsmentioning

confidence: 99%

Compaction dynamics of a magnetized powder

2009

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“…This force restricts the relative movement of the particles resulting in the formation of agglomerates that affects the packing particles. Hence, the volume fraction for random close packing depends on the Hamaker constant and the particle size (Dong et al, 2006;Forsyth et al, 2001;Yu et al, 2003). This influence of the interparticle forces obtained in packing experiments under gravity, can be applied to the packing of particles inside a suspension.…”

Section: ⎝⎠mentioning

confidence: 99%

Determination of the packing fraction of silica nanoparticles from the rheological and viscoelastic measurements of nanofluids

Mondragón

Juliá

Barba

et al. 2012

Chemical Engineering Science

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“…Electrostatic forces typically arise from particle contacts or frictional charging. Molecular interactions are based on short-range nonspecific forces (secondary bonds or van der Waals attractions), and these interactions are increased as particle size is decreased, and they vary with changes in relative humidity (1,2). In addition, gravitational forces affect powder flow.…”

Section: Introductionmentioning

confidence: 99%

Development of a New Method to Get a Reliable Powder Flow Characteristics Using Only 1 to 2 g of Powder

et al. 2010

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Abstract. In powder technology, it is often important to directly measure real powder flow rate from a small amount of powder. For example, in pharmaceutical industry, a frequent problem is to determine powder flow properties of new active pharmaceutical ingredient (API) in an early stage of the development when the amount of API is limited. The purpose of this paper is to introduce a new direct method to measure powder flow when the material is poorly flowing (cohesive) and the amount of material is about 1 to 2 g. The measuring system was simple, consisting of a flow chamber and electronic balance and an automated optical detection system, and for each measurement, only 1 to 2 g of sample was required. Based on the results obtained with this testing method, three selected sugar excipients, three grades of microcrystalline cellulose, and APIs (caffeine, carbamazepine, and paracetamol) can be classified as freely flowing, intermediate flowing, and poorly flowing powders, respectively. The average relative standard deviation for the flow time determinations was not more than 2-10%. The present novel flowability testing method provides a new tool for a rapid determination of flowing characteristics of powders (e.g., inhalation powders) and granules at a small scale.

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Effects of Interparticle Force on the Packing of Spherical Granular Material

Cited by 51 publications

References 13 publications

Compaction dynamics of a magnetized powder

Compaction dynamics of a magnetized powder

Determination of the packing fraction of silica nanoparticles from the rheological and viscoelastic measurements of nanofluids

Development of a New Method to Get a Reliable Powder Flow Characteristics Using Only 1 to 2 g of Powder

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