Shear banding phenomena in a Laponite suspension

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Shear localization in an aqueous clay suspension of Laponite is investigated through dynamic light scattering, which provides access both to the dynamics of the system (homodyne mode) and to the local velocity profile (heterodyne mode). When the shear bands form, a relaxation of the dynamics typical of a gel phase is observed in the unsheared band soon after flow stop, suggesting that an arrested dynamics is present during the shear localization regime. Periodic oscillations of the flow behavior, typical of a stick-slip phenomenon, are also observed when shear localization occurs. Both results are discussed in the light of various theoretical models for soft glassy materials.
5 pages, 3 figures

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Fluid Dynamics

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http://salesiana.dossiersoluciones.com/handle/123456789/129686

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0705.4596
 http://arxiv.org/abs/0705.4596

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arXiv