Storage and Flow of Solids
01 Jan 1964-
About: The article was published on 1964-01-01 and is currently open access. It has received 585 citations till now. The article focuses on the topics: Flow (mathematics).
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TL;DR: A calibration procedure based on the comparison between the experimental angle of repose (AoR) by using 3D scan in laboratory and the automated measurement of the numerical AoR (aMAoR), which prevented the subjective selection of AoR, improved the identification accuracy and therefore decreased minimum amount of suitable parameter combinations for DEM calibration.
15 citations
TL;DR: In this article, 12 pharmaceutical diluents have been characterized by determination of particle size distribution, tensile strength and the shear cell parameters cohesiveness (C), flow factor (FF) and the effective angle of friction (dL).
Abstract: Twelve pharmaceutical diluents have been characterized by determination of particle size distribution, tensile strength and the shear cell parameters cohesiveness (C), flow factor (FF) and the effective angle of friction (dL). Nine materials possessed a size distribution approximating log-normal. Avicel and the starch samples exhibited highest cohesiveness and lowest flow factors. The correlation between C and FF was good, but T was unrelated to either. Values of C/T varied from 0.19 to 3. 16. It is suggested that in many cases, estimates of T may not fit the yield locus at the corresponding bulk density because of different modes of consolidation in the tensile tester and shear cell.
15 citations
TL;DR: The relationship between bulk powder cohesion and ease of powder dispersion is explored in this paper, where a quantitative relationship has been established between the unconfined yield strength and the dispersion efficiency for the powders tested.
15 citations
TL;DR: In this article, the authors explore the causal relationships in coal blending, and use these to predict the handlability of a blend, and to establish the basis needed to optimise blending choices.
15 citations
01 Jan 2007
TL;DR: Powder pressing is a forming process used in a wide range of industries, such as powder metallurgy, industrial ceramics, pharmaceutical tablets, food, detergents, fertilizers, batteries, magnets, and nuclear and hard metals as discussed by the authors.
Abstract: Publisher Summary Powder pressing is a forming process used in a wide range of industries, such as powder metallurgy, industrial ceramics, pharmaceutical tablets, food, detergents, fertilizers, batteries, magnets, and nuclear and hard metals. The process is fast, economic and lends itself to high-volume production. In spite of the broad range of powder materials and applications, powder pressing has common features in various industries. The operation consists of filling a die with powder, compressing using rigid punches, followed by ejection from the die. During this process, the loose powder bed is made compact according to a given shape and microstructure. Powder metallurgy compacts are required to have sufficient strength to withstand handling and have a dense, uniform, and defect-free microstructure. Compaction is followed by sintering to achieve near-full density and maximum strength for structural applications. The properties of a powder compact depend on the characteristics of the powder and the choice of process parameters during compaction. In order to achieve the desired compact properties the powders are mixed with other ingredients having specific functions. For example, lubricants are added to reduce the friction and wear of the tools and equipment. Steel powders may be mixed with graphite, which acts as a lubricant during compaction and alloying material can be mixed during sintering. Hard metal cutting tools are compressed by embedding the hard ceramic component into a soft metal matrix. In pharmaceutical tablets, the active ingredient is mixed with excipients such as lubricants (to control the friction between powder and tooling), glidants (to improve flow), binders (to improve strength), and disintegrants, which are polymers that swell in contact with water.
15 citations