Shear-induced fractures and three-dimensional motions in an organogel

Pauline Grondin 1 Sébastien Manneville 2 Jean-Luc Pozzo 3 Annie Colin 4
1 CRPP - Centre de recherches Paul Pascal
2 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
3 LCOO - Laboratoire de chimie organique et organométallique
4 LOF - Laboratoire du Futur
Abstract : The flow behavior of a viscoelastic organogel is investigated using ultrasonic velocimetry combined with rheometry. Our gel presents a decreasing flow curve, i.e., the measured stress decreases as a function of the applied shear rate. Strikingly, we note that the local flow curve calculated from the velocity profiles also exhibits a decreasing part. We attribute this regime to the presence of a fracturing process and three-dimensional motions in the bulk of the sample.
Keywords : Physical gels and microgels Material behavior Non-Newtonian fluid flows Acoustical measurements and instrumentation
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Journal articles
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Pauline Grondin, Sébastien Manneville, Jean-Luc Pozzo, Annie Colin. Shear-induced fractures and three-dimensional motions in an organogel. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2008, 77 (1), pp.11401. ⟨10.1103/PhysRevE.77.011401⟩. ⟨ensl-00526126⟩

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