caa a22 4500 605466734 CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00397-015-0847-x doi (NATIONALLICENCE)springer-10.1007/s00397-015-0847-x The effect of premature wall yield on creep testing of strongly flocculated suspensions [Elektronische Daten] [Anthony Stickland, Ashish Kumar, Tiara Kusuma, Peter Scales, Amy Tindley, Simon Biggs, Richard Buscall] Measuring yielding in cohesive suspensions is often hampered by slip at measurement surfaces. This paper presents creep data for strongly flocculated suspensions obtained using vane-in-cup tools with differing cup-to-vane diameter ratios. The three suspensions were titania and alumina aggregated at their isoelectric points and polymer-flocculated alumina. The aim was to find the diameter ratio where slip or premature yielding at the cup wall had no effect on the transient behaviour. The large diameter ratio results showed readily understandable material behaviour comprising linear viscoelasticity at low stresses, strain-softening close to yielding, time-dependent yield across a range of stresses and then viscous flow. Tests in small ratio geometries however showed more complex responses. Effects attributed to the cup wall included delayed softening, slip, multiple yielding and stick-slip events, and unsteady flow. The conclusion was that cups have to be relatively large to eliminate wall artefacts. A diameter ratio of three was sufficient in practice, although the minimum ratio must be material dependent. Springer-Verlag Berlin Heidelberg, 2015 Suspension rheology nationallicence Creep nationallicence Vane-in-cup nationallicence Wall slip nationallicence Strongly flocculated suspension nationallicence Stickland Anthony Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut Kumar Ashish Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut Kusuma Tiara Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut Scales Peter Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut Tindley Amy Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, The University of Leeds, LS2 9JT, Leeds, UK aut Biggs Simon Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, The University of Leeds, LS2 9JT, Leeds, UK aut Buscall Richard MSACT Research and Consulting, 34, Maritime Court, Haven Road, EX2 8GP, Exeter, UK aut Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 337-352 0035-4511 54:5<337 2015 54 397 https://doi.org/10.1007/s00397-015-0847-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0847-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stickland Anthony Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut NATIONALLICENCE 700 1- Kumar Ashish Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut NATIONALLICENCE 700 1- Kusuma Tiara Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut NATIONALLICENCE 700 1- Scales Peter Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia aut NATIONALLICENCE 700 1- Tindley Amy Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, The University of Leeds, LS2 9JT, Leeds, UK aut NATIONALLICENCE 700 1- Biggs Simon Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, The University of Leeds, LS2 9JT, Leeds, UK aut NATIONALLICENCE 700 1- Buscall Richard MSACT Research and Consulting, 34, Maritime Court, Haven Road, EX2 8GP, Exeter, UK aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 337-352 0035-4511 54:5<337 2015 54 397