Rheology of cyclopentane hydrate slurry in a model oil-continuous emulsion
Liquid cyclopentane (CP)-based hydrate slurry is prepared at atmospheric pressure from a density-matched water-in-oil emulsion by quenching it to a lower temperature at a fixed shear rate. Viscosity increases by several orders of magnitude and is indicative of hydrate formation on the dispersed wate...
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| Veröffentlicht in: | Rheologica acta 2016-03, Vol.55 (3), p.235-243 |
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| creator | Karanjkar, Prasad U. Ahuja, Amit Zylyftari, Genti Lee, Jae W. F. Morris, Jeffrey |
| description | Liquid cyclopentane (CP)-based hydrate slurry is prepared at atmospheric pressure from a density-matched water-in-oil emulsion by quenching it to a lower temperature at a fixed shear rate. Viscosity increases by several orders of magnitude and is indicative of hydrate formation on the dispersed water droplets and subsequent agglomeration. A mechanism in which the hairy and porous hydrate growth combined with enhanced agglomeration due to liquid bridges formed by wetted water films leads to the development of a porosity, resulting in greater effective dispersed phase fraction, is proposed. This is supported by experiments performed for water volume fractions ranging from 10 to 45 % at variable shear rates, temperatures, and surfactant (Span 80) concentrations. The observed dependence on the degree of sub-cooling, with lower slurry viscosity obtained at higher sub-cooling, and the possible anti-agglomerant like effect of high Span 80 concentrations, support our proposed mechanism. The hydrate slurries are found to exhibit shear-thinning and a small degree of thixotropy. |
| doi_str_mv | 10.1007/s00397-016-0911-1 |
| format | Article |
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The observed dependence on the degree of sub-cooling, with lower slurry viscosity obtained at higher sub-cooling, and the possible anti-agglomerant like effect of high Span 80 concentrations, support our proposed mechanism. 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Morris, Jeffrey</creatorcontrib><title>Rheology of cyclopentane hydrate slurry in a model oil-continuous emulsion</title><title>Rheologica acta</title><addtitle>Rheol Acta</addtitle><description>Liquid cyclopentane (CP)-based hydrate slurry is prepared at atmospheric pressure from a density-matched water-in-oil emulsion by quenching it to a lower temperature at a fixed shear rate. Viscosity increases by several orders of magnitude and is indicative of hydrate formation on the dispersed water droplets and subsequent agglomeration. A mechanism in which the hairy and porous hydrate growth combined with enhanced agglomeration due to liquid bridges formed by wetted water films leads to the development of a porosity, resulting in greater effective dispersed phase fraction, is proposed. This is supported by experiments performed for water volume fractions ranging from 10 to 45 % at variable shear rates, temperatures, and surfactant (Span 80) concentrations. The observed dependence on the degree of sub-cooling, with lower slurry viscosity obtained at higher sub-cooling, and the possible anti-agglomerant like effect of high Span 80 concentrations, support our proposed mechanism. The hydrate slurries are found to exhibit shear-thinning and a small degree of thixotropy.</description><subject>Agglomeration</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemistry and Materials Science</subject><subject>Complex Fluids and Microfluidics</subject><subject>Cooling effects</subject><subject>Dependence</subject><subject>Dispersion</subject><subject>Food Science</subject><subject>Liquid bridges</subject><subject>Materials Science</subject><subject>Mechanical Engineering</subject><subject>Original Contribution</subject><subject>Polymer Sciences</subject><subject>Porosity</subject><subject>Quenching</subject><subject>Rheological properties</subject><subject>Rheology</subject><subject>Shear rate</subject><subject>Shear thinning (liquids)</subject><subject>Slurries</subject><subject>Soft and Granular Matter</subject><subject>Thixotropy</subject><subject>Viscosity</subject><subject>Water drops</subject><subject>Water film</subject><issn>0035-4511</issn><issn>1435-1528</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kEtLxDAUhYMoOI7-AHcB19E8mqSzFPHJgCC6Dml6M9Mhk4xJu-i_t0MFV67u4pzzXfgQumb0llGq7wqlYqUJZYrQFWOEnaAFq4QkTPL6FC2mWJJKMnaOLkrZUcq00nyB3j62kELajDh57EYX0gFibyPg7dhm2wMuYch5xF3EFu9TCwGnLhCXYt_FIQ0Fw34IpUvxEp15Gwpc_d4l-np6_Hx4Iev359eH-zVxFRc9cZKzFrhy1K60kt63oGrQ2ivRUF5bWVsQUKuaK-0pbTiXtbeyaWwjnPBMLNHNzD3k9D1A6c0uDTlOLw3nik82eCWnFptbLqdSMnhzyN3e5tEwao7KzKzMTMrMUZk5kvm8KVM3biD_kf8f_QCOB27s</recordid><startdate>20160301</startdate><enddate>20160301</enddate><creator>Karanjkar, Prasad U.</creator><creator>Ahuja, Amit</creator><creator>Zylyftari, Genti</creator><creator>Lee, Jae W.</creator><creator>F. 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Morris, Jeffrey</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c423t-c521de26c0a9765ffde68e77f63b028a58ae3e868267f00b2258fa5bbab3c3f13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Agglomeration</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemistry and Materials Science</topic><topic>Complex Fluids and Microfluidics</topic><topic>Cooling effects</topic><topic>Dependence</topic><topic>Dispersion</topic><topic>Food Science</topic><topic>Liquid bridges</topic><topic>Materials Science</topic><topic>Mechanical Engineering</topic><topic>Original Contribution</topic><topic>Polymer Sciences</topic><topic>Porosity</topic><topic>Quenching</topic><topic>Rheological properties</topic><topic>Rheology</topic><topic>Shear rate</topic><topic>Shear thinning (liquids)</topic><topic>Slurries</topic><topic>Soft and Granular Matter</topic><topic>Thixotropy</topic><topic>Viscosity</topic><topic>Water drops</topic><topic>Water film</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Karanjkar, Prasad U.</creatorcontrib><creatorcontrib>Ahuja, Amit</creatorcontrib><creatorcontrib>Zylyftari, Genti</creatorcontrib><creatorcontrib>Lee, Jae W.</creatorcontrib><creatorcontrib>F. 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Morris, Jeffrey</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Rheology of cyclopentane hydrate slurry in a model oil-continuous emulsion</atitle><jtitle>Rheologica acta</jtitle><stitle>Rheol Acta</stitle><date>2016-03-01</date><risdate>2016</risdate><volume>55</volume><issue>3</issue><spage>235</spage><epage>243</epage><pages>235-243</pages><issn>0035-4511</issn><eissn>1435-1528</eissn><abstract>Liquid cyclopentane (CP)-based hydrate slurry is prepared at atmospheric pressure from a density-matched water-in-oil emulsion by quenching it to a lower temperature at a fixed shear rate. Viscosity increases by several orders of magnitude and is indicative of hydrate formation on the dispersed water droplets and subsequent agglomeration. A mechanism in which the hairy and porous hydrate growth combined with enhanced agglomeration due to liquid bridges formed by wetted water films leads to the development of a porosity, resulting in greater effective dispersed phase fraction, is proposed. This is supported by experiments performed for water volume fractions ranging from 10 to 45 % at variable shear rates, temperatures, and surfactant (Span 80) concentrations. The observed dependence on the degree of sub-cooling, with lower slurry viscosity obtained at higher sub-cooling, and the possible anti-agglomerant like effect of high Span 80 concentrations, support our proposed mechanism. The hydrate slurries are found to exhibit shear-thinning and a small degree of thixotropy.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s00397-016-0911-1</doi><tpages>9</tpages></addata></record> |
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| subjects | Agglomeration Characterization and Evaluation of Materials Chemistry and Materials Science Complex Fluids and Microfluidics Cooling effects Dependence Dispersion Food Science Liquid bridges Materials Science Mechanical Engineering Original Contribution Polymer Sciences Porosity Quenching Rheological properties Rheology Shear rate Shear thinning (liquids) Slurries Soft and Granular Matter Thixotropy Viscosity Water drops Water film |
| title | Rheology of cyclopentane hydrate slurry in a model oil-continuous emulsion |
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