Flow and arrest in stressed granular materials

Soft Matter ◽

10.1039/d1sm01344k ◽

2022 ◽

Author(s):

Ishan Srivastava ◽

Leo Silbert ◽

Jeremy Lechman ◽

Gary Grest

Keyword(s):

Granular Materials ◽

Materials Handling ◽

Abrupt Cessation ◽

Industrial Materials ◽

Applied Stresses

Flowing granular materials often abruptly arrest if not driven by sufficient applied stresses. Such abrupt cessation of motion can be economically expensive in industrial materials handling and processing, and is...

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Application of simulation technologies in the analysis of granular material behaviour during transport and storage

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering ◽

10.1243/095440805x7044 ◽

2005 ◽

Vol 219 (1) ◽

pp. 43-52 ◽

Cited By ~ 4

Author(s):

P Chapelle ◽

N Christakis ◽

J Wang ◽

N Strusevich ◽

M. K. Patel ◽

...

Keyword(s):

Granular Material ◽

Granular Materials ◽

Large Scale ◽

Computational Models ◽

Research Programme ◽

Size Segregation ◽

Materials Handling ◽

Simulation Tools ◽

And Storage

Problems in the preservation of the quality of granular material products are complex and arise from a series of sources during transport and storage. In either designing a new plant or, more likely, analysing problems that give rise to product quality degradation in existing operations, practical measurement and simulation tools and technologies are required to support the process engineer. These technologies are required to help in both identifying the source of such problems and then designing them out. As part of a major research programme on quality in particulate manufacturing computational models have been developed for segregation in silos, degradation in pneumatic conveyors, and the development of caking during storage, which use where possible, micro-mechanical relationships to characterize the behaviour of granular materials. The objective of the work presented here is to demonstrate the use of these computational models of unit processes involved in the analysis of large-scale processes involving the handling of granular materials. This paper presents a set of simulations of a complete large-scale granular materials handling operation, involving the discharge of the materials from a silo, its transport through a dilute-phase pneumatic conveyor, and the material storage in a big bag under varying environmental temperature and humidity conditions. Conclusions are drawn on the capability of the computational models to represent key granular processes, including particle size segregation, degradation, and moisture migration caking.

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Research on the Mechanism of Multi-Source Piezoelectric Vibratory Feeder

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.241-244.1427 ◽

2012 ◽

Vol 241-244 ◽

pp. 1427-1430 ◽

Cited By ~ 2

Author(s):

Yang Wang ◽

Wen Fu Wu ◽

Su Ping Shi

Keyword(s):

Granular Materials ◽

Traveling Wave ◽

Vibratory Feeder ◽

Materials Handling ◽

Elastic Particle

Vibration feeder is the device of subsequent orientation feeding using vibration for the granular or power materials. This device could be used in food, medicine, chemistry and so on. We announce the phenomenon of materials handling based on testing and analyzing the granular materials in the multi-source piezoelectric vibratory feeder. The results show that the vibratory spreads is the traveling wave in this device, when the device is operated. The elastic particle is the elliptic movement at the end of the stuff box. The dynamic of material movement mainly come from the traveling wave caused by particle elliptical movement, the destruction to the grain’s natural balance status caused by the vibration and the geometric position-limit guiding structure of the device and so on.

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In situ observation of the martensitic transformation in (Mg,Y)-PSZ

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144036 ◽

1986 ◽

Vol 44 ◽

pp. 500-501

Author(s):

R-R. Lee

Keyword(s):

Martensitic Transformation ◽

High Strength ◽

Nucleation And Growth ◽

In Situ Observation ◽

Considerable Potential ◽

Transmission Electron ◽

Structural Applications ◽

Applied Stresses ◽

Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

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