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| Authors | P.C.F. Møller, S. Rodts, M.A.J. Michels, D. Bonn | | Title | Shear banding and yield stress in soft glassy materials |
| Journal | Physical Review E |
| Volume | 77 |
| Year | 2008 |
| Issue | 4 |
| Pages | 041507- |
| ISSN | 15393755 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Van der Waals-Zeeman Institute (WZI) |
| Abstract | Shear localization is a generic feature of flows in yield stress fluids and soft glassy materials but is incompletely understood. In the classical picture of yield stress fluids, shear banding happens because of a stress heterogeneity. Using recent developments in magnetic resonance imaging velocimetry, we show here for a colloidal gel that even in a homogeneous stress situation shear banding occurs, and that the width of the flowing band is uniquely determined by the macroscopically imposed shear rate rather than the stress. We present a simple physical model for flow of the gel showing that shear banding (localization) is a flow instability that is intrinsic to the material, and confirm the model predictions for our system using rheology and light scattering. |
| Document type | Article |
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