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 2001
TL;DR: In this paper, the fundamentals of powder consolidation and flow behavior using a reasonable combination of particle and continuum mechanics are explained using the model "stiff particles with soft contacts" and the combined influence of elastic, plastic, and viscous repulsion in particle contacts is demonstrated.
Abstract: The well-known flow problems of cohesive particulate solids in storage and transportation containers, conveyors or process apparatuses - mainly mentioned by Jenike - leads to bridging, channeling, scillating mass flow rates and particle characteristics with feeding and dosing problems. Taking into account this selected technical problems, it is really necessary to deal with the fundamentals of particulate solids consolidation and flow behavior, namely from using a reasonable combination of particle and continuum mechanics. The fundamentals of powder consolidation and flow behavior using a reasonable combination of particle and continuum mechanics are explained. By means of the model “stiff particles with soft contacts” the combined influence of elastic, plastic, and viscous repulsion in particle contacts is demonstrated. On this physical basis, the stationary, instantaneous, and time yield loci as well as uniaxial compressive strength are derived and shown for a very cohesive sub-micron titania powder. Finally, these models are used to assess the powder flow behavior by means of flow function ff c .
3 citations
Journal Article•
TL;DR: In this article, the authors simulate the static and dynamic processes of granular flow during filling and discharging of a vertical-sided silo with conical hopper bottom, where the granular material is an assembly of 7,500 soybeans.
Abstract: In this study, we simulate the static and dynamic processes of granular flow during filling and discharging of a vertical-sided silo with conical hopper bottom. The granular material is an assembly of 7,500 soybeans. Based on the discrete element method, the governing equations for the granular flow are solved by the centred finite difference scheme. The effects of inlet flow rate and bottom angles on pressure distribution on the hopper wall throughout the static process of material filling into the silo are investigated. Influences of bottom angle on the discharging problem in a varied mass-flow silo and a constant mass-flow silo are also discussed. AMS Subject Classification: 93A30, 76T25
3 citations
01 Jan 2003
TL;DR: In this paper, the authors discuss the generation of exposable dust cloud by reentrainment and redispersion of deposited dust in air, and three dust dispersion systems are described in the chapter: transient cloud system, open-circuit system, and closed circuit system.
Abstract: This chapter discusses generation of exposable dust cloud by reentrainment and redispersion of deposited dust in air. Three dust dispersion systems are described in the chapter: transient cloud system, open-circuit system, and closed-circuit system. The open-circuit principle is the most satisfactory alternative for dust dispersion. However, it is essential that the dust dispersion system be designed carefully to ensure that the degree of agglomeration of the particles in the cloud and the cloud turbulence corresponds with the state actually wanted. Quite often, it is desirable or even necessary to keep the consumption of dust or powder at a minimum. In such cases, the transient air blast techniques may—provided the limitations of the technique are borne in mind—offer the best solution.
3 citations
TL;DR: In this paper, a tremonha conica de silos is dimensioned to obtain a fluxo massico of a lama vermelha, with the intuito of dimensioning it to enable fornecer a massico fluxo.
Abstract: Problemas em silos podem ocorrer, em muitos casos, devido ao incorreto dimensionamento de sua geometria por nao considerar as propriedades de fluxo do material granulado. Um dos fatores que afetam as propriedades de fluxo do material e a umidade, que favorece a formacao de arcos coesivos no material no interior do silo impedindo o fluxo massico desejado. Portanto, este artigo objetivou analisar as propriedades de fluxo da lama vermelha, para diferentes teores de umidade, com o intuito de dimensionar a tremonha conica de silos para fornecer um fluxo massico do material. Inicialmente, as propriedades de fluxo da lama vermelha foram obtidas em laboratorio utilizando o Celula de Cisalhamento Tipo Jenike e em seguida o dimensionamento da tremonha do silo foi realizado usando as teorias de Jenike e Enstad, ou seja, o diâmetro minimo de descarga e o ângulo de inclinacao foram determinados para cada teor de umidade. Ensaios em laboratorios usando silos de acrilicos com diferentes tremonhas foram realizados e os resultados experimentais apresentaram boa concordância com os resultados teoricos.
3 citations
TL;DR: In this paper, the Flexible Wall Biaxial Tester is introduced for fundamental analysis of powder flow, which can be applied to a sample along perpendicular axes, which makes the tester very suitable for fundamental investigation.
3 citations