NDLI: The effect of premature wall yield on creep testing of strongly flocculated suspensions

Content Provider	Springer Nature Link
Author	Stickland, Anthony D. Kumar, Ashish Kusuma, Tiara E. Scales, Peter J. Tindley, Amy Biggs, Simon Buscall, Richard
Copyright Year	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 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.
Starting Page	337
Ending Page	352
Page Count	16
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	54
Issue Number	5
e-ISSN	14351528
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-03-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Suspension rheology Creep Vane-in-cup Wall slip Strongly flocculated suspension Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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