Rotated, circular arc models of stress in silos applied to core-flow and vertical rat-holes

Hdl Handle:
http://hdl.handle.net/10149/98680
Title:
Rotated, circular arc models of stress in silos applied to core-flow and vertical rat-holes
Authors:
Matchett, A. J. (Andrew)
Affiliation:
University of Teesside. School of Science and Technology. Chemical Engineering.
Citation:
Matchett, A. J. (2006) 'Rotated, circular arc models of stress in silos applied to core-flow and vertical rat-holes', Powder Technology, 162 (2), pp.87-99.
Publisher:
Elsevier
Journal:
Powder Technology
Issue Date:
1-Mar-2006
URI:
http://hdl.handle.net/10149/98680
DOI:
10.1016/j.powtec.2005.12.013
Abstract:
Rotated, circular arc geometry models have been developed to describe core-flow and vertical rat-holes in cylindrical hoppers and silos. The conceptual problem of the variation of incremental element thickness has been overcome, resulting in models of greater theoretical rigour. Models have been developed in an average stress and point stress form. Analysis shows that stresses vary with vessel radius through an arc angle parameter, ε, as well as with bed depth. The models indicate that conditions at a rat-hole annulus wall are quite different from the mean stress or wall stress and this has implications for stability and flow. A modified failure criterion, based upon azimuthal stress has been used to assess the stability of deep rat-holes, and a range of rat-hole stability determined, which is dependent upon material properties and vessel diameter. Predicted stress distributions are functions of assumed internal stress distribution relationships. More physical data are required in this area to enable reliable modelling.
Type:
Article
Language:
en
Keywords:
bulk solids; core-flow; hoppers; rat-holes; silos
ISSN:
0032-5910
Rights:
Author can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 13/05/2010]
Citation Count:
4 [Scopus, 13/05/2010]

Full metadata record

DC FieldValue Language
dc.contributor.authorMatchett, A. J. (Andrew)en
dc.date.accessioned2010-05-13T12:26:30Z-
dc.date.available2010-05-13T12:26:30Z-
dc.date.issued2006-03-01-
dc.identifier.citationPowder Technology; 162(2):87-99en
dc.identifier.issn0032-5910-
dc.identifier.doi10.1016/j.powtec.2005.12.013-
dc.identifier.urihttp://hdl.handle.net/10149/98680-
dc.description.abstractRotated, circular arc geometry models have been developed to describe core-flow and vertical rat-holes in cylindrical hoppers and silos. The conceptual problem of the variation of incremental element thickness has been overcome, resulting in models of greater theoretical rigour. Models have been developed in an average stress and point stress form. Analysis shows that stresses vary with vessel radius through an arc angle parameter, ε, as well as with bed depth. The models indicate that conditions at a rat-hole annulus wall are quite different from the mean stress or wall stress and this has implications for stability and flow. A modified failure criterion, based upon azimuthal stress has been used to assess the stability of deep rat-holes, and a range of rat-hole stability determined, which is dependent upon material properties and vessel diameter. Predicted stress distributions are functions of assumed internal stress distribution relationships. More physical data are required in this area to enable reliable modelling.en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAuthor can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 13/05/2010]en
dc.subjectbulk solidsen
dc.subjectcore-flowen
dc.subjecthoppersen
dc.subjectrat-holesen
dc.subjectsilosen
dc.titleRotated, circular arc models of stress in silos applied to core-flow and vertical rat-holesen
dc.typeArticleen
dc.contributor.departmentUniversity of Teesside. School of Science and Technology. Chemical Engineering.en
dc.identifier.journalPowder Technologyen
ref.citationcount4 [Scopus, 13/05/2010]en
or.citation.harvardMatchett, A. J. (2006) 'Rotated, circular arc models of stress in silos applied to core-flow and vertical rat-holes', Powder Technology, 162 (2), pp.87-99.-
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