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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01 Jan 2012
TL;DR: It is well known that powders become more "cohesive" as their mean particulate size decreases This phenomenon is evidenced by such characteristics as poor flowability, clumping, avalanching, difficulty in fluidizing, and formation of quasi-stable, low-density configurations that are easily compacted.
Abstract: It is well known that powders become more ‘cohesive’ as their mean particulate size decreases This phenomenon is evidenced by such characteristics as poor flowability, clumping, avalanching, difficulty in fluidizing, and formation of quasi-stable, low-density configurations that are easily compacted Gravity is often the primary driving force for powder movement in common powder processing and transfer operations Because of this, gravity plays a role in how the flow behavior of powders is typically characterized As a result, the ‘cohesiveness’ of a powder varies with gravity-level, with a powder appearing more ‘cohesive’ as the effective gravity level is decreased
5 citations
TL;DR: In this paper, the influence of particle size distribution (PSD) width on the internal friction and internal pressure ratio of granular materials, and the related flowability of such material when uniaxially compressed in a closed volume was investigated.
5 citations
01 Jan 2001
TL;DR: In this article, it was demonstrated conclusively that the bend caused by a bend in a pneumatic conveyor occurs not in the bend itself, but in the straight pipe immediately downstream of the bend, with the length over which the pressure drop is developed being of the order of eight meters for lean phase (suspension) flow and rather less (three to five meters) for slugging or plug flow.
Abstract: In 1989 it was demonstrated conclusively that the pressure drop caused by a bend in a pneumatic conveyor occurs not in the bend itself, but in the straight pipe immediately downstream of the bend, with the length over which the pressure drop is developed being of the order of eight meters for lean phase (suspension) flow and rather less (three to five meters) for slugging or plug flow. The prediction of the effects of bends in pneumatic conveying systems has previously eluded analytical study based on physical models, owing to the difficulty in obtaining a physical model which yields behavior representative of that observed in practice. This chapter presents the results of a study based on a simple physical model which, owing to its novel approach, does yield realistic behavior. The model is based on momentum transfer between two distinct phases of flow in the pipeline, and predictions made using this model have been compared with measurements taken from an industrial-scale pneumatic conveying system. The comparison is promising with regard to the potential for development of this line of modelling for the prediction of bend effects in pipelines. At present this model has been tested for lean phase conveying only.
5 citations
TL;DR: In this paper, the authors provide a review on the flow of free-flowing particles inside silos, focusing on the theoretical approaches allowing numerical simulation and modeling of these systems.
Abstract: Abstract This paper provides a review on the flow of free-flowing particles inside silos. We have previously reviewed in detail the experimental studies in this field. In the present work, the focus is placed on the theoretical approaches allowing numerical simulation and modeling of these systems. Modeling of granular flow in silos is very significant due to the advantages of modeling compared to experiments. The simulation methods are divided into four main groups: analytical methods, finite element method, discrete element method, and hybrid models. In each section, the most significant researches are reviewed. The drawbacks and advantages of each method are discussed, and the effects of different parameters are reviewed. Finally, the perspective of future work and the main challenges in this area are discussed.
4 citations
TL;DR: In this paper, a cylindrical hopper was simulated and validated by performing 3D experiments and the model was used to investigate the effect of material properties and hopper design.
4 citations