Modeling of shear localization during confined granular flow in silos within non-local hypoplasticity

Wójcik, Michał; Tejchman, J.

doi:10.1016/j.powtec.2009.01.021

Cited by 75 publications

(42 citation statements)

References 43 publications

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“…14C and D) and in the interior of the initially dense material with smooth walls (in the form of curvilinear zones above the outlet, Fig. 14B) similarly as in the experiments (Drescher et al, 1978;Nedderman and Laohakul, 1980;Michalowski, 1984;Tejchman and Gudehus, 2000) and in the FE-calculations (Tejchman and Gudehus, 2000;Wojcik and Tejchman, 2009).…”

Section: Piv Resultssupporting

confidence: 57%

“…The most important applications are in the oil industry, such as oil and gas separation. Measurements analyzed offline can be used to estimate process efficiencies, to identify flow problems (Tejchman and Gudehus, 2000) and to validate computational flow models (Wojcik and Tejchman, 2009). The intention of the paper is to check the capability of ECT to visualize solid concentrations during dynamic granular flow in a rectangular model silo.…”

Section: Introductionmentioning

confidence: 99%

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Application of ECT to solid concentration measurements during granular flow in a rectangular model silo

Niedostatkiewicz

Tejchman

Grudzień

et al. 2010

Chemical Engineering Research and Design

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Section: Piv Resultssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Application of ECT to solid concentration measurements during granular flow in a rectangular model silo

Niedostatkiewicz

Tejchman

Grudzień

et al. 2010

Chemical Engineering Research and Design

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“…Granular shear zones can occur at any attitude from vertical to horizontal and are thus good indicators of flow direction in magmatic slurries. Vertical conical shear zones of this type are common in grain silos (Wojcik and Tejchman, 2009), and similar structures are sometimes found in feeder vents in primocrystladen magmas like that supplying the Basement Sill of the McMurdo Dry Valleys ( Fig. 14; Marsh 2004; Bedard et al 2007).…”

Section: Granular Processesmentioning

confidence: 80%

On some fundamentals of igneous petrology

Marsh

2013

Contrib Mineral Petrol

135

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The age-old process of crystal fractionation leading to the diversity of the igneous rocks and Earth itself is an exceedingly well-understood chemical process in magmatism and physical chemistry. But the broader physical aspects of this and related processes have proven elusive on many fronts, especially in its relation to the spatial variations in rock composition, texture, and macroscopic features like layering. Magmatic systems, be they volcanic, dikes, sills, or plutons, are generally analyzed with a problem at hand and an end result in mind. The processes invoked to solve these problems, which are most often purely chemical, are often unique to each problem with few if any general principles emerging that are central to understanding the wider perspective of magmatic processes and problems. An attempt is made at the outset to provide a list of inviolate Magmatic First Principles that are relevant to analyzing most magmatic problems. These involve: initial conditions; critical crystallinity; solidification fronts; transport and emplacement fluxes; phenocrysts, xenocrysts, primocrysts; crystal size; layering and crystal sorting; thermal convection; magmatic processes are physical. Along with these principles, two reference magmatic systems are suggested where the initial conditions and outcome are unequivocal: the Sudbury impact melt sheet and the Hawaiian lava lakes. Sudbury formed in *5 min by superheated magma crystallized to a near uniform sequence, while the tiny lava lakes, formed of crystal-laden slurries, form a highly differentiated layered sequence. The major difference is in the initial conditions of formation, especially the nature of the input materials. The challenge is to construct and analyze magmatic systems (i.e., magma chambers, sills, dikes, and lavas) using these reference end members and the suggested principles. The Hawaiian 500,000 year volcanic record exhibits what can be expected as input materials, namely a highly varied output of magma of an overall composition reflecting the abundance of entrained olivine primocrysts. The provenance of these crystals is varied, and within any single sample, the population may be highly heterogeneous in composition from crystal to crystal, yet the overall pattern of chemical fractionation is exceedingly regular and well defined. If similar inputs go to form large intrusions, these systems will undoubtedly be dominated by crystal-rich slurries, which provide a vast set of physical processes promoting exotic layering and, at the same time, given the effects of annealing and continued crystal growth, a final chemical record adhering to all the time-honored effects of crystal fractionation. The long assumed initial condition of instantaneously emplaced crystal-free magmas cannot reasonably produce the observed rock records.

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“…Some researchers have conducted assays on model silos made to scale (Ahn et al, 2008;Askegaard and Munch-Andersen, 1985;Chou and Hsu, 2003;Chou et al, 2002;Coetzee and Els, 2009;Grudzien et al, 2011Grudzien et al, , 2010Nedderman and Tüzün, 1979;Niedostatkiewicz et al, 2009;Rotter et al, 1989;Sielamowicz et al, 2005Sielamowicz et al, , 2006Wu et al, 2009;Wójcik and Tejchman, 2009) for studying the actions produced by the stored materials in silos. However, it is well-known that errors of scale have often led to results which differ considerably from behavior at full scale (Chen et al, 2007;Nielsen and Askegaard, 1977).…”

Section: Introductionmentioning

confidence: 99%

Simulation of silo filling and discharge using ANSYS and comparison with experimental data

Gallego

Ruíz

Rodríguez

2015

Computers and Electronics in Agriculture

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Modeling of shear localization during confined granular flow in silos within non-local hypoplasticity

Cited by 75 publications

References 43 publications

Application of ECT to solid concentration measurements during granular flow in a rectangular model silo

Application of ECT to solid concentration measurements during granular flow in a rectangular model silo

On some fundamentals of igneous petrology

Simulation of silo filling and discharge using ANSYS and comparison with experimental data

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