Microstructure and rheology relationships for shear thickening colloidal dispersions
The non-Newtonian shear rheology of colloidal dispersions is the result of the competition and balance between hydrodynamic (dissipative) and thermodynamic (conservative) forces that lead to a non-equilibrium microstructure under flow. We present the first experimental measurements of the shear-indu...
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| Veröffentlicht in: | Journal of fluid mechanics 2015-04, Vol.769, p.242-276 |
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| creator | Gurnon, A. Kate Wagner, Norman J. |
| description | The non-Newtonian shear rheology of colloidal dispersions is the result of the competition and balance between hydrodynamic (dissipative) and thermodynamic (conservative) forces that lead to a non-equilibrium microstructure under flow. We present the first experimental measurements of the shear-induced microstructure of a concentrated near-hard-sphere colloidal dispersion through the shear thickening transition using small-angle neutron scattering (SANS) measurements made in three orthogonal planes during steady shear. New instrumentation coupled with theoretical derivations of the stress-SANS rule enable rigorous testing of the relationship between this non-equilibrium microstructure and the observed macroscopic shear rheology. The thermodynamic and hydrodynamic components of the stress that drive shear thinning, shear thickening and first normal stress differences are separately defined via stress-SANS rules and compared to the rheological behaviour of the dispersion during steady shear. Observations of shear-induced hydrocluster formation is in good agreement with Stokesian dynamics simulation results by Foss & Brady (J. Fluid Mech., vol. 407, 2000, pp. 167–200). This unique set of measurements of shear rheology and non-equilibrium microstructure of a model system provides new insights into suspension mechanics as well as a method to rigorously test constitutive equations for colloidal suspension rheology. |
| doi_str_mv | 10.1017/jfm.2015.128 |
| format | Article |
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Kate ; Wagner, Norman J.</creator><creatorcontrib>Gurnon, A. Kate ; Wagner, Norman J.</creatorcontrib><description>The non-Newtonian shear rheology of colloidal dispersions is the result of the competition and balance between hydrodynamic (dissipative) and thermodynamic (conservative) forces that lead to a non-equilibrium microstructure under flow. We present the first experimental measurements of the shear-induced microstructure of a concentrated near-hard-sphere colloidal dispersion through the shear thickening transition using small-angle neutron scattering (SANS) measurements made in three orthogonal planes during steady shear. New instrumentation coupled with theoretical derivations of the stress-SANS rule enable rigorous testing of the relationship between this non-equilibrium microstructure and the observed macroscopic shear rheology. The thermodynamic and hydrodynamic components of the stress that drive shear thinning, shear thickening and first normal stress differences are separately defined via stress-SANS rules and compared to the rheological behaviour of the dispersion during steady shear. Observations of shear-induced hydrocluster formation is in good agreement with Stokesian dynamics simulation results by Foss & Brady (J. Fluid Mech., vol. 407, 2000, pp. 167–200). This unique set of measurements of shear rheology and non-equilibrium microstructure of a model system provides new insights into suspension mechanics as well as a method to rigorously test constitutive equations for colloidal suspension rheology.</description><identifier>ISSN: 0022-1120</identifier><identifier>EISSN: 1469-7645</identifier><identifier>DOI: 10.1017/jfm.2015.128</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Colloids ; Computer simulation ; Constitutive equations ; Constitutive relationships ; Dispersion ; Dispersions ; Dynamics ; Fluid mechanics ; Forces (mechanics) ; Friction ; Hydrodynamics ; Instrumentation ; Mathematical models ; Mechanics ; Microstructure ; Neutron scattering ; Normal stress ; Orthogonality ; Planes ; Rheological properties ; Rheology ; Shear ; Shear thickening (liquids) ; Shear thinning (liquids) ; Simulation ; Symmetry ; Test procedures ; Thickening</subject><ispartof>Journal of fluid mechanics, 2015-04, Vol.769, p.242-276</ispartof><rights>2015 Cambridge University Press</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c405t-9045e579a7ee079c6b008d1254baf963eb8bd8abcf270175b1196d787ee15b063</citedby><cites>FETCH-LOGICAL-c405t-9045e579a7ee079c6b008d1254baf963eb8bd8abcf270175b1196d787ee15b063</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0022112015001287/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,776,780,27901,27902,55603</link.rule.ids></links><search><creatorcontrib>Gurnon, A. Kate</creatorcontrib><creatorcontrib>Wagner, Norman J.</creatorcontrib><title>Microstructure and rheology relationships for shear thickening colloidal dispersions</title><title>Journal of fluid mechanics</title><addtitle>J. Fluid Mech</addtitle><description>The non-Newtonian shear rheology of colloidal dispersions is the result of the competition and balance between hydrodynamic (dissipative) and thermodynamic (conservative) forces that lead to a non-equilibrium microstructure under flow. We present the first experimental measurements of the shear-induced microstructure of a concentrated near-hard-sphere colloidal dispersion through the shear thickening transition using small-angle neutron scattering (SANS) measurements made in three orthogonal planes during steady shear. New instrumentation coupled with theoretical derivations of the stress-SANS rule enable rigorous testing of the relationship between this non-equilibrium microstructure and the observed macroscopic shear rheology. The thermodynamic and hydrodynamic components of the stress that drive shear thinning, shear thickening and first normal stress differences are separately defined via stress-SANS rules and compared to the rheological behaviour of the dispersion during steady shear. Observations of shear-induced hydrocluster formation is in good agreement with Stokesian dynamics simulation results by Foss & Brady (J. Fluid Mech., vol. 407, 2000, pp. 167–200). This unique set of measurements of shear rheology and non-equilibrium microstructure of a model system provides new insights into suspension mechanics as well as a method to rigorously test constitutive equations for colloidal suspension rheology.</description><subject>Colloids</subject><subject>Computer simulation</subject><subject>Constitutive equations</subject><subject>Constitutive relationships</subject><subject>Dispersion</subject><subject>Dispersions</subject><subject>Dynamics</subject><subject>Fluid mechanics</subject><subject>Forces (mechanics)</subject><subject>Friction</subject><subject>Hydrodynamics</subject><subject>Instrumentation</subject><subject>Mathematical models</subject><subject>Mechanics</subject><subject>Microstructure</subject><subject>Neutron scattering</subject><subject>Normal stress</subject><subject>Orthogonality</subject><subject>Planes</subject><subject>Rheological properties</subject><subject>Rheology</subject><subject>Shear</subject><subject>Shear thickening (liquids)</subject><subject>Shear thinning (liquids)</subject><subject>Simulation</subject><subject>Symmetry</subject><subject>Test procedures</subject><subject>Thickening</subject><issn>0022-1120</issn><issn>1469-7645</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNptkD1PwzAURS0EEqWw8QMssZLynhPH8YgqvqQiljJbduI0Lmkc7GTovycRHRiY3nLevbqHkFuEFQKKh319WDFAvkJWnJEFZrlMRJ7xc7IAYCxBZHBJrmLcA2AKUizI9t2VwcchjOUwBkt1V9HQWN_63ZEG2-rB-S42ro-09oHGxupAh8aVX7Zz3Y6Wvm29q3RLKxd7G-KMX5OLWrfR3pzuknw-P23Xr8nm4-Vt_bhJygz4kEjIuOVCamEtCFnmBqCokPHM6FrmqTWFqQptypqJaR43iDKvRDHhyA3k6ZLc_eb2wX-PNg5q78fQTZUKpWRcpmlRTNT9LzUPjcHWqg_uoMNRIajZm5q8qdmbmrxN-OqE64MJrtrZP6n_PfwAtOlxGg</recordid><startdate>20150425</startdate><enddate>20150425</enddate><creator>Gurnon, A. 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Kate ; Wagner, Norman J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c405t-9045e579a7ee079c6b008d1254baf963eb8bd8abcf270175b1196d787ee15b063</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Colloids</topic><topic>Computer simulation</topic><topic>Constitutive equations</topic><topic>Constitutive relationships</topic><topic>Dispersion</topic><topic>Dispersions</topic><topic>Dynamics</topic><topic>Fluid mechanics</topic><topic>Forces (mechanics)</topic><topic>Friction</topic><topic>Hydrodynamics</topic><topic>Instrumentation</topic><topic>Mathematical models</topic><topic>Mechanics</topic><topic>Microstructure</topic><topic>Neutron scattering</topic><topic>Normal stress</topic><topic>Orthogonality</topic><topic>Planes</topic><topic>Rheological properties</topic><topic>Rheology</topic><topic>Shear</topic><topic>Shear thickening (liquids)</topic><topic>Shear thinning (liquids)</topic><topic>Simulation</topic><topic>Symmetry</topic><topic>Test procedures</topic><topic>Thickening</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gurnon, A. 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Kate</au><au>Wagner, Norman J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microstructure and rheology relationships for shear thickening colloidal dispersions</atitle><jtitle>Journal of fluid mechanics</jtitle><addtitle>J. Fluid Mech</addtitle><date>2015-04-25</date><risdate>2015</risdate><volume>769</volume><spage>242</spage><epage>276</epage><pages>242-276</pages><issn>0022-1120</issn><eissn>1469-7645</eissn><abstract>The non-Newtonian shear rheology of colloidal dispersions is the result of the competition and balance between hydrodynamic (dissipative) and thermodynamic (conservative) forces that lead to a non-equilibrium microstructure under flow. We present the first experimental measurements of the shear-induced microstructure of a concentrated near-hard-sphere colloidal dispersion through the shear thickening transition using small-angle neutron scattering (SANS) measurements made in three orthogonal planes during steady shear. New instrumentation coupled with theoretical derivations of the stress-SANS rule enable rigorous testing of the relationship between this non-equilibrium microstructure and the observed macroscopic shear rheology. The thermodynamic and hydrodynamic components of the stress that drive shear thinning, shear thickening and first normal stress differences are separately defined via stress-SANS rules and compared to the rheological behaviour of the dispersion during steady shear. Observations of shear-induced hydrocluster formation is in good agreement with Stokesian dynamics simulation results by Foss & Brady (J. Fluid Mech., vol. 407, 2000, pp. 167–200). This unique set of measurements of shear rheology and non-equilibrium microstructure of a model system provides new insights into suspension mechanics as well as a method to rigorously test constitutive equations for colloidal suspension rheology.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2015.128</doi><tpages>35</tpages></addata></record> |
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| subjects | Colloids Computer simulation Constitutive equations Constitutive relationships Dispersion Dispersions Dynamics Fluid mechanics Forces (mechanics) Friction Hydrodynamics Instrumentation Mathematical models Mechanics Microstructure Neutron scattering Normal stress Orthogonality Planes Rheological properties Rheology Shear Shear thickening (liquids) Shear thinning (liquids) Simulation Symmetry Test procedures Thickening |
| title | Microstructure and rheology relationships for shear thickening colloidal dispersions |
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