Yielding of complex liquid foams
| Autor: | Olivier Pitois, Yacine Khidas, François Gorlier |
|---|---|
| Přispěvatelé: | Rhéophysique, Laboratoire Navier (navier umr 8205), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS), Optimisation des propriétés fonctionnelles des matériaux aérés particulaires, ProMAP, ANR-13-RMNP-0003-01,Optimisation des propriétés fonctionnelles des matériaux aérés particulaires, ANR-13-RMNP-0003-01 |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Capillary pressure
Materials science Mechanical Engineering Bubble Micromechanics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Granular material 01 natural sciences 0104 chemical sciences Rheology Mechanics of Materials Volume fraction Emulsion General Materials Science Particle size Composite material 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Journal of Rheology Journal of Rheology, American Institute of Physics, 2017, 61 (5), pp.919-930. ⟨10.1122/1.4994786⟩ |
| ISSN: | 0148-6055 |
| Popis: | International audience; Foamy complex matter is increasingly encountered in various application fields. Whereas final functional properties of hardened foams have been widely investigated, rheology of complex foamy materials has received less attention. Here, we consider two different types of complex matter to be mixed with aqueous foam and we investigate the resulting yield stress, which is known to control both static and flow properties of foams: (1) A concentrated emulsion possessing intrinsic yield stress properties and (2) granular suspensions which are known to exhibit particle size effects when incorporated into foam. Yield stress of emulsion foams is found to be governed by both the Bingham-capillary number (i.e., the emulsion yield stress scaled by the bubble capillary pressure) and the volume fraction of interstitial emulsion. Foams made with small solid particles reveal granular packings confined between foam bubbles and the resulting yield stress is shown also to be governed by the Bingham-capillary number, here based on Mohr-Coulomb criterion applied to the interstitial granular material. Yield stress of foams made with large particles is well described by the theory developed from micromechanics of particle-loaded yield stress materials, suggesting that for such size ratios, foam can be considered as a continuous matrix. Within the range of intermediate size ratio values, the normalized foam yield stress undergoes an exponential decay that seems to be related to the number of bubbles separating neighboring particles. Finally, reported results are used to estimate the thicknesses of a foamed material, such as isolating foamed mortars, that can be deposited on vertical substrates. |
| Databáze: | OpenAIRE |
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