Visualization of the breakdown of dilute particles gels during steady-shear
A feature of models concerning the rheology of coagulated suspensions is the development of shear planes. An experimental set-up was developed in which we investigated, by visual analysis, whether shear planes really develop in such systems during steady-shear. A transparent coagulated PTFE dispersi...
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| Veröffentlicht in: | Rheologica acta 1998-12, Vol.37 (6), p.549-555 |
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| container_title | Rheologica acta |
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| creator | FOLKERSMA, R VAN DIEMEN, A. J. G LAVEN, J VAN DER PLAS, G. A. J STEIN, H. N |
| description | A feature of models concerning the rheology of coagulated suspensions is the development of shear planes. An experimental set-up was developed in which we investigated, by visual analysis, whether shear planes really develop in such systems during steady-shear. A transparent coagulated PTFE dispersion was used, in which the refractive indices of the continuous and dispersed phases were matched, for the formation of a gel. Coagulation was effected by adding NaCl to a concentration of 0.5 M. Polystyrene particles were built into the gel structure as tracer particles. During steady-shear the velocities and trajectories of the tracer particles were analyzed by Particle Tracking Velocimetry (PTV). Indeed layers with approximately the same velocity were observed for a coagulated PTFE-gel, during steady-shear. Deviations from rectilinear motion of the tracer particles were observed. These observations correspond with the assumptions of the giant floc model in which the shear is not distributed homogeneously, but limited to certain shear planes. Deviations from rectilinear motion of the tracer particles in a dilute gel correspond with the results found by Folkersma et al. (1998) in which the distance by which a moving particle entrains its neighbours was assumed to be larger at low volume fractions (≈0.1) than at high volume fractions (≈0.4). |
| doi_str_mv | 10.1007/s003970050141 |
| format | Article |
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J. G ; LAVEN, J ; VAN DER PLAS, G. A. J ; STEIN, H. N</creator><creatorcontrib>FOLKERSMA, R ; VAN DIEMEN, A. J. G ; LAVEN, J ; VAN DER PLAS, G. A. J ; STEIN, H. N</creatorcontrib><description>A feature of models concerning the rheology of coagulated suspensions is the development of shear planes. An experimental set-up was developed in which we investigated, by visual analysis, whether shear planes really develop in such systems during steady-shear. A transparent coagulated PTFE dispersion was used, in which the refractive indices of the continuous and dispersed phases were matched, for the formation of a gel. Coagulation was effected by adding NaCl to a concentration of 0.5 M. Polystyrene particles were built into the gel structure as tracer particles. During steady-shear the velocities and trajectories of the tracer particles were analyzed by Particle Tracking Velocimetry (PTV). Indeed layers with approximately the same velocity were observed for a coagulated PTFE-gel, during steady-shear. Deviations from rectilinear motion of the tracer particles were observed. These observations correspond with the assumptions of the giant floc model in which the shear is not distributed homogeneously, but limited to certain shear planes. Deviations from rectilinear motion of the tracer particles in a dilute gel correspond with the results found by Folkersma et al. (1998) in which the distance by which a moving particle entrains its neighbours was assumed to be larger at low volume fractions (≈0.1) than at high volume fractions (≈0.4).</description><identifier>ISSN: 0035-4511</identifier><identifier>EISSN: 1435-1528</identifier><identifier>DOI: 10.1007/s003970050141</identifier><identifier>CODEN: RHEAAK</identifier><language>eng</language><publisher>Berlin: Springer</publisher><subject>Chemistry ; Coagulation ; Colloidal gels. Colloidal sols ; Colloidal state and disperse state ; Cross-disciplinary physics: materials science; rheology ; Deformation; material flow ; Dilution ; Exact sciences and technology ; Gels ; Gels and sols ; General and physical chemistry ; Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc ; Material form ; Particle tracking ; Particle tracking velocimetry ; Phase matching ; Physics ; Polystyrene resins ; Polytetrafluoroethylene ; Refractivity ; Rheological properties ; Rheology ; Shear planes ; Steady shear flows ; Tracer particles ; Velocity measurement</subject><ispartof>Rheologica acta, 1998-12, Vol.37 (6), p.549-555</ispartof><rights>1999 INIST-CNRS</rights><rights>Rheologica Acta is a copyright of Springer, (1998). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c292t-f2c430c87006cc582bfdf6e0c9250a6b672059cf51266db648833ed839a9c3ff3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1613614$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>FOLKERSMA, R</creatorcontrib><creatorcontrib>VAN DIEMEN, A. J. G</creatorcontrib><creatorcontrib>LAVEN, J</creatorcontrib><creatorcontrib>VAN DER PLAS, G. A. J</creatorcontrib><creatorcontrib>STEIN, H. N</creatorcontrib><title>Visualization of the breakdown of dilute particles gels during steady-shear</title><title>Rheologica acta</title><description>A feature of models concerning the rheology of coagulated suspensions is the development of shear planes. An experimental set-up was developed in which we investigated, by visual analysis, whether shear planes really develop in such systems during steady-shear. A transparent coagulated PTFE dispersion was used, in which the refractive indices of the continuous and dispersed phases were matched, for the formation of a gel. Coagulation was effected by adding NaCl to a concentration of 0.5 M. Polystyrene particles were built into the gel structure as tracer particles. During steady-shear the velocities and trajectories of the tracer particles were analyzed by Particle Tracking Velocimetry (PTV). Indeed layers with approximately the same velocity were observed for a coagulated PTFE-gel, during steady-shear. Deviations from rectilinear motion of the tracer particles were observed. These observations correspond with the assumptions of the giant floc model in which the shear is not distributed homogeneously, but limited to certain shear planes. Deviations from rectilinear motion of the tracer particles in a dilute gel correspond with the results found by Folkersma et al. (1998) in which the distance by which a moving particle entrains its neighbours was assumed to be larger at low volume fractions (≈0.1) than at high volume fractions (≈0.4).</description><subject>Chemistry</subject><subject>Coagulation</subject><subject>Colloidal gels. Colloidal sols</subject><subject>Colloidal state and disperse state</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Deformation; material flow</subject><subject>Dilution</subject><subject>Exact sciences and technology</subject><subject>Gels</subject><subject>Gels and sols</subject><subject>General and physical chemistry</subject><subject>Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc</subject><subject>Material form</subject><subject>Particle tracking</subject><subject>Particle tracking velocimetry</subject><subject>Phase matching</subject><subject>Physics</subject><subject>Polystyrene resins</subject><subject>Polytetrafluoroethylene</subject><subject>Refractivity</subject><subject>Rheological properties</subject><subject>Rheology</subject><subject>Shear planes</subject><subject>Steady shear flows</subject><subject>Tracer particles</subject><subject>Velocity measurement</subject><issn>0035-4511</issn><issn>1435-1528</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpVkM1LAzEQxYMoWKtH7wG9RifJJrt7lKJVLHhRr0s2H23quluTLFL_eqMtiKeBmffePH4InVO4ogDldQTgdQkggBb0AE1owQWhglWHaJJPghSC0mN0EuMagJayZBP0-OrjqDr_pZIfejw4nFYWt8GqNzN8_i6M78Zk8UaF5HVnI17aLmIzBt8vcUxWmS2JK6vCKTpyqov2bD-n6OXu9nl2TxZP84fZzYJoVrNEHNMFB13lplJrUbHWGSct6JoJULLNvUDU2gnKpDStLKqKc2sqXqtac-f4FF3scjdh-BhtTM16GEOfXzaMSQYlZE9WkZ1KhyHGYF2zCf5dhW1Dofnh1fzjlfWX-1QVtepcUL328c8kKZeZ6DfAhmlJ</recordid><startdate>19981201</startdate><enddate>19981201</enddate><creator>FOLKERSMA, R</creator><creator>VAN DIEMEN, A. 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N</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c292t-f2c430c87006cc582bfdf6e0c9250a6b672059cf51266db648833ed839a9c3ff3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Chemistry</topic><topic>Coagulation</topic><topic>Colloidal gels. Colloidal sols</topic><topic>Colloidal state and disperse state</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Deformation; material flow</topic><topic>Dilution</topic><topic>Exact sciences and technology</topic><topic>Gels</topic><topic>Gels and sols</topic><topic>General and physical chemistry</topic><topic>Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc</topic><topic>Material form</topic><topic>Particle tracking</topic><topic>Particle tracking velocimetry</topic><topic>Phase matching</topic><topic>Physics</topic><topic>Polystyrene resins</topic><topic>Polytetrafluoroethylene</topic><topic>Refractivity</topic><topic>Rheological properties</topic><topic>Rheology</topic><topic>Shear planes</topic><topic>Steady shear flows</topic><topic>Tracer particles</topic><topic>Velocity measurement</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>FOLKERSMA, R</creatorcontrib><creatorcontrib>VAN DIEMEN, A. 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N</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><jtitle>Rheologica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>FOLKERSMA, R</au><au>VAN DIEMEN, A. J. G</au><au>LAVEN, J</au><au>VAN DER PLAS, G. A. J</au><au>STEIN, H. N</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Visualization of the breakdown of dilute particles gels during steady-shear</atitle><jtitle>Rheologica acta</jtitle><date>1998-12-01</date><risdate>1998</risdate><volume>37</volume><issue>6</issue><spage>549</spage><epage>555</epage><pages>549-555</pages><issn>0035-4511</issn><eissn>1435-1528</eissn><coden>RHEAAK</coden><abstract>A feature of models concerning the rheology of coagulated suspensions is the development of shear planes. An experimental set-up was developed in which we investigated, by visual analysis, whether shear planes really develop in such systems during steady-shear. A transparent coagulated PTFE dispersion was used, in which the refractive indices of the continuous and dispersed phases were matched, for the formation of a gel. Coagulation was effected by adding NaCl to a concentration of 0.5 M. Polystyrene particles were built into the gel structure as tracer particles. During steady-shear the velocities and trajectories of the tracer particles were analyzed by Particle Tracking Velocimetry (PTV). Indeed layers with approximately the same velocity were observed for a coagulated PTFE-gel, during steady-shear. Deviations from rectilinear motion of the tracer particles were observed. These observations correspond with the assumptions of the giant floc model in which the shear is not distributed homogeneously, but limited to certain shear planes. Deviations from rectilinear motion of the tracer particles in a dilute gel correspond with the results found by Folkersma et al. (1998) in which the distance by which a moving particle entrains its neighbours was assumed to be larger at low volume fractions (≈0.1) than at high volume fractions (≈0.4).</abstract><cop>Berlin</cop><pub>Springer</pub><doi>10.1007/s003970050141</doi><tpages>7</tpages></addata></record> |
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| subjects | Chemistry Coagulation Colloidal gels. Colloidal sols Colloidal state and disperse state Cross-disciplinary physics: materials science rheology Deformation material flow Dilution Exact sciences and technology Gels Gels and sols General and physical chemistry Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc Material form Particle tracking Particle tracking velocimetry Phase matching Physics Polystyrene resins Polytetrafluoroethylene Refractivity Rheological properties Rheology Shear planes Steady shear flows Tracer particles Velocity measurement |
| title | Visualization of the breakdown of dilute particles gels during steady-shear |
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