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Erschienen in: Rheologica Acta 10/2018

24.08.2018 | Original Contribution

A bootstrap mechanism for non-colloidal suspension viscosity

verfasst von: Roger I. Tanner, Christopher Ness, Arif Mahmud, Shaocong Dai, Jiyoung Moon

Erschienen in: Rheologica Acta | Ausgabe 10/2018

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Abstract

The role of friction in non-colloidal suspensions is examined with a model which splits the viscosity into a frictionless component (τ*) plus a frictional component which depends on the ratio of the particle pressure (P) to the shear stress (τ). The model needs the input by computation of τ* and P and a suitable choice of particle friction coefficient (μ). It can be extended to elongational flows and cases where sphere roughness is important; volume fractions up to 0.5 are considered. It is shown that friction acts in a feedback or “bootstrap” manner to increase the suspension viscosity. The analysis is also useful for deducing the friction coefficient in suspensions from experimental data. It was applied to several sets of experimental data and reasonable correlations of the viscosities were demonstrated. An example of the correlation for spheres in a silicone oil is shown for volume fractions 0.1–0.5.

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Metadaten
Titel
A bootstrap mechanism for non-colloidal suspension viscosity
verfasst von
Roger I. Tanner
Christopher Ness
Arif Mahmud
Shaocong Dai
Jiyoung Moon
Publikationsdatum
24.08.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Rheologica Acta / Ausgabe 10/2018
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI
https://doi.org/10.1007/s00397-018-1103-y

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