Modelling of paste flows subject to liquid phase migration
Identifieur interne : 002817 ( Istex/Corpus ); précédent : 002816; suivant : 002818Modelling of paste flows subject to liquid phase migration
Auteurs : M. J. Patel ; S. Blackburn ; D. I. WilsonSource :
- International Journal for Numerical Methods in Engineering [ 0029-5981 ] ; 2007-12-03.
English descriptors
Abstract
Particulate pastes undergoing extrusion can exhibit differential velocities between the solid and liquid phases, termed liquid phase migration (LPM). This is observed experimentally but understanding and predictive capacity for paste and extruder design is limited. Most models for LPM feature one‐dimensional analyses. Here, a two‐dimensional finite element model based on soil mechanics approaches (modified Cam‐Clay) was developed where the liquid and the solids skeleton are treated separately. Adaptive remeshing routines were developed to overcome the significant mesh distortion arising from the large strains inherent in extrusion. Material data to evaluate the model's behaviour were taken from the literature. The predictive capacity of the model is evaluated for different ram velocities and die entry angles (smooth walls). Results are compared with experimental findings in the literature and good qualitative agreement is found. Key results are plots of pressure contributions and extrudate liquid fraction against ram displacement, and maps of permeability, liquid velocity and voids ratio. Pore liquid pressure always dominates extrusion pressure. The relationship between extrusion geometry, ram speed and LPM is complex. Overall, for a given geometry, higher ram speeds give less migration. Pastes flowing into conical entry dies give different voids ratio distributions and do not feature static zones. Copyright © 2007 John Wiley & Sons, Ltd.
Url:
DOI: 10.1002/nme.2040
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ISTEX:928EFF3160FB6117F1FB5447A01FEAF7C9ADBC6CLe document en format XML
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Wilson</name><affiliation><mods:affiliation>Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:928EFF3160FB6117F1FB5447A01FEAF7C9ADBC6C</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1002/nme.2040</idno><idno type="url">https://api.istex.fr/document/928EFF3160FB6117F1FB5447A01FEAF7C9ADBC6C/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002817</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Modelling of paste flows subject to liquid phase migration</title><author><name sortKey="Patel, M J" sort="Patel, M J" uniqKey="Patel M" first="M. J." last="Patel">M. J. Patel</name><affiliation><mods:affiliation>Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</mods:affiliation></affiliation></author><author><name sortKey="Blackburn, S" sort="Blackburn, S" uniqKey="Blackburn S" first="S." last="Blackburn">S. Blackburn</name><affiliation><mods:affiliation>IRC in High Performance Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.</mods:affiliation></affiliation></author><author><name sortKey="Wilson, D I" sort="Wilson, D I" uniqKey="Wilson D" first="D. I." last="Wilson">D. I. Wilson</name><affiliation><mods:affiliation>Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">International Journal for Numerical Methods in Engineering</title><title level="j" type="abbrev">Int. J. Numer. Meth. Engng.</title><idno type="ISSN">0029-5981</idno><idno type="eISSN">1097-0207</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2007-12-03">2007-12-03</date><biblScope unit="volume">72</biblScope><biblScope unit="issue">10</biblScope><biblScope unit="page" from="1157">1157</biblScope><biblScope unit="page" to="1180">1180</biblScope></imprint><idno type="ISSN">0029-5981</idno></series><idno type="istex">928EFF3160FB6117F1FB5447A01FEAF7C9ADBC6C</idno><idno type="DOI">10.1002/nme.2040</idno><idno type="ArticleID">NME2040</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0029-5981</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>FEM</term><term>modified Cam‐Clay</term><term>paste</term><term>phase maldistribution</term><term>phase migration</term><term>ram extrusion</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Particulate pastes undergoing extrusion can exhibit differential velocities between the solid and liquid phases, termed liquid phase migration (LPM). This is observed experimentally but understanding and predictive capacity for paste and extruder design is limited. Most models for LPM feature one‐dimensional analyses. Here, a two‐dimensional finite element model based on soil mechanics approaches (modified Cam‐Clay) was developed where the liquid and the solids skeleton are treated separately. Adaptive remeshing routines were developed to overcome the significant mesh distortion arising from the large strains inherent in extrusion. Material data to evaluate the model's behaviour were taken from the literature. The predictive capacity of the model is evaluated for different ram velocities and die entry angles (smooth walls). Results are compared with experimental findings in the literature and good qualitative agreement is found. Key results are plots of pressure contributions and extrudate liquid fraction against ram displacement, and maps of permeability, liquid velocity and voids ratio. Pore liquid pressure always dominates extrusion pressure. The relationship between extrusion geometry, ram speed and LPM is complex. Overall, for a given geometry, higher ram speeds give less migration. Pastes flowing into conical entry dies give different voids ratio distributions and do not feature static zones. Copyright © 2007 John Wiley & Sons, Ltd.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>M. J. Patel</name><affiliations><json:string>Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</json:string></affiliations></json:item><json:item><name>S. Blackburn</name><affiliations><json:string>IRC in High Performance Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.</json:string></affiliations></json:item><json:item><name>D. I. Wilson</name><affiliations><json:string>Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>FEM</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>modified Cam‐Clay</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>paste</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>phase maldistribution</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>phase migration</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>ram extrusion</value></json:item></subject><articleId><json:string>NME2040</json:string></articleId><language><json:string>eng</json:string></language><abstract>Particulate pastes undergoing extrusion can exhibit differential velocities between the solid and liquid phases, termed liquid phase migration (LPM). This is observed experimentally but understanding and predictive capacity for paste and extruder design is limited. Most models for LPM feature one‐dimensional analyses. Here, a two‐dimensional finite element model based on soil mechanics approaches (modified Cam‐Clay) was developed where the liquid and the solids skeleton are treated separately. Adaptive remeshing routines were developed to overcome the significant mesh distortion arising from the large strains inherent in extrusion. Material data to evaluate the model's behaviour were taken from the literature. The predictive capacity of the model is evaluated for different ram velocities and die entry angles (smooth walls). Results are compared with experimental findings in the literature and good qualitative agreement is found. Key results are plots of pressure contributions and extrudate liquid fraction against ram displacement, and maps of permeability, liquid velocity and voids ratio. Pore liquid pressure always dominates extrusion pressure. The relationship between extrusion geometry, ram speed and LPM is complex. Overall, for a given geometry, higher ram speeds give less migration. Pastes flowing into conical entry dies give different voids ratio distributions and do not feature static zones. 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This is observed experimentally but understanding and predictive capacity for paste and extruder design is limited. Most models for LPM feature one‐dimensional analyses. Here, a two‐dimensional finite element model based on soil mechanics approaches (modified Cam‐Clay) was developed where the liquid and the solids skeleton are treated separately. Adaptive remeshing routines were developed to overcome the significant mesh distortion arising from the large strains inherent in extrusion. Material data to evaluate the model's behaviour were taken from the literature. The predictive capacity of the model is evaluated for different ram velocities and die entry angles (smooth walls). Results are compared with experimental findings in the literature and good qualitative agreement is found. Key results are plots of pressure contributions and extrudate liquid fraction against ram displacement, and maps of permeability, liquid velocity and voids ratio. Pore liquid pressure always dominates extrusion pressure. The relationship between extrusion geometry, ram speed and LPM is complex. Overall, for a given geometry, higher ram speeds give less migration. Pastes flowing into conical entry dies give different voids ratio distributions and do not feature static zones. 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J.</givenNames><familyName>Patel</familyName></personName></creator><creator xml:id="au2" creatorRole="author" affiliationRef="#af2"><personName><givenNames>S.</givenNames><familyName>Blackburn</familyName></personName></creator><creator xml:id="au3" creatorRole="author" affiliationRef="#af1" corresponding="yes"><personName><givenNames>D. 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This is observed experimentally but understanding and predictive capacity for paste and extruder design is limited. Most models for LPM feature one‐dimensional analyses. Here, a two‐dimensional finite element model based on soil mechanics approaches (modified Cam‐Clay) was developed where the liquid and the solids skeleton are treated separately. Adaptive remeshing routines were developed to overcome the significant mesh distortion arising from the large strains inherent in extrusion.</p><p>Material data to evaluate the model's behaviour were taken from the literature. The predictive capacity of the model is evaluated for different ram velocities and die entry angles (smooth walls). Results are compared with experimental findings in the literature and good qualitative agreement is found.</p><p>Key results are plots of pressure contributions and extrudate liquid fraction against ram displacement, and maps of permeability, liquid velocity and voids ratio. Pore liquid pressure always dominates extrusion pressure.</p><p>The relationship between extrusion geometry, ram speed and LPM is complex. Overall, for a given geometry, higher ram speeds give less migration. Pastes flowing into conical entry dies give different voids ratio distributions and do not feature static zones. Copyright © 2007 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Modelling of paste flows subject to liquid phase migration</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>MODELLING OF PASTE FLOWS SUBJECT TO LIQUID PHASE MIGRATION</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Modelling of paste flows subject to liquid phase migration</title></titleInfo><name type="personal"><namePart type="given">M. 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I.</namePart><namePart type="family">Wilson</namePart><affiliation>Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</affiliation><description>Correspondence: Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, U.K.</description><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2007-12-03</dateIssued><dateCaptured encoding="w3cdtf">2006-04-06</dateCaptured><dateValid encoding="w3cdtf">2007-02-10</dateValid><copyrightDate encoding="w3cdtf">2007</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">12</extent><extent unit="tables">2</extent><extent unit="references">36</extent></physicalDescription><abstract lang="en">Particulate pastes undergoing extrusion can exhibit differential velocities between the solid and liquid phases, termed liquid phase migration (LPM). This is observed experimentally but understanding and predictive capacity for paste and extruder design is limited. Most models for LPM feature one‐dimensional analyses. Here, a two‐dimensional finite element model based on soil mechanics approaches (modified Cam‐Clay) was developed where the liquid and the solids skeleton are treated separately. Adaptive remeshing routines were developed to overcome the significant mesh distortion arising from the large strains inherent in extrusion. Material data to evaluate the model's behaviour were taken from the literature. The predictive capacity of the model is evaluated for different ram velocities and die entry angles (smooth walls). Results are compared with experimental findings in the literature and good qualitative agreement is found. Key results are plots of pressure contributions and extrudate liquid fraction against ram displacement, and maps of permeability, liquid velocity and voids ratio. Pore liquid pressure always dominates extrusion pressure. The relationship between extrusion geometry, ram speed and LPM is complex. Overall, for a given geometry, higher ram speeds give less migration. Pastes flowing into conical entry dies give different voids ratio distributions and do not feature static zones. Copyright © 2007 John Wiley & Sons, Ltd.</abstract><note type="funding">EPSRC/PowdermatriX Faraday Partnership - No. GR/S/70340; </note><subject lang="en"><genre>keywords</genre><topic>FEM</topic><topic>modified Cam‐Clay</topic><topic>paste</topic><topic>phase maldistribution</topic><topic>phase migration</topic><topic>ram extrusion</topic></subject><relatedItem type="host"><titleInfo><title>International Journal for Numerical Methods in Engineering</title></titleInfo><titleInfo type="abbreviated"><title>Int. J. Numer. Meth. 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