Shear-thinning in concentrated rigid fiber suspensions: Aggregation induced by adhesive interactions
| Autor: | Sihem Bounoua, Julien Férec, Pavel Kuzhir, Elisabeth Lemaire, Gilles Ausias |
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| Přispěvatelé: | Laboratoire de physique de la matière condensée (LPMC), Centre National de la Recherche Scientifique (CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Institut de Recherche Dupuy de Lôme (IRDL), Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Shear thinning Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Shear rate Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter Viscosity Mechanics of Materials 0103 physical sciences Newtonian fluid Particle General Materials Science Adhesive Fiber [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] Composite material 0210 nano-technology Shear flow |
| Zdroj: | Journal of Rheology Journal of Rheology, American Institute of Physics, 2016, 60, pp.1279-1300. ⟨10.1122/1.4965431⟩ |
| ISSN: | 0148-6055 |
| Popis: | International audience; Synopsis This work is focused on shear thinning behavior of suspensions of rigid non-Brownian fibers dispersed in a Newtonian liquid. The work consists in developing a new theoretical model and conducting accurate experimental measurements. The shear thinning is expected to be caused by adhesive interactions between fibers. Experiments on polyamide (PA) fibers (present work) and carbon nanotube (CNT) suspensions [Khalkhal et al., J. Rheol. 55, 153-175 (2011)] have revealed the following features: (a) the flow curves exhibit a pronounced pseudo-plastic behavior interpreted in terms of the progressive aggregate destruction at the increasing shear rate; (b) the enhancement of the shear thinning with an increasing particle volume fraction is observed and explained by an increase of the strength of effective interactions between particles, as their concentration increases; (c) a weak yield stress of the PA fiber suspensions is detected in a controlled-stress mode and explained by the liquid-solid transition as the concentration of aggregates (constituted by fibers) approaches the close packing limit; (d) the shear thinning is much stronger in CNT suspensions because the adhesive interactions play a more important role between nano-sized CNT particles than between micron-sized PA fibers. A theoretical model considering the coexistence of transient aggregates with free non-aggregated fibers has been developed. The model allows viscosity calculations in terms of the aggregation parameter – the ratio of adhesive to hydrodynamic forces. It captures qualitatively the above-mentioned shear thinning behaviors and fits reasonably well to the experimental data on both PA fiber and CNT suspensions. |
| Databáze: | OpenAIRE |
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