Journal article
The effect of premature wall yield on creep testing of strongly flocculated suspensions
A Stickland, A Kumar, T Kusuma, P Scales, A Tindley, S Biggs, R Buscall
Rheologica Acta | Springer Berlin Heidelberg | Published : 2015
Abstract
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 stre..
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Awarded by Engineering and Physical Sciences Research Council
Funding Acknowledgements
The authors thank Daniel Lester for insightful discussions. Ashish Kumar was supported in this work by an Australian Postgraduate Award through the Australian Research Council. Tiara Kusuma was funded by a Melbourne International Research Scholarship through The University of Melbourne. Infrastructure support at Melbourne was provided by the Particulate Fluids Processing Centre, a Special Research Centre of the Australian Research Council. Simon Biggs acknowledges the support of the Nexia Solutions University Research Alliance for Particle Science and Technology and the University of Leeds. Simon Biggs and Amy Tindley were supported in this work as part of the TSEC programme KNOO and are grateful to the EPSRC for funding under grant EP/C549465/1.