| Type de publication : |
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Articles dans des revues avec comité de lecture |
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| Domaine : |
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Physique/Matière Condensée/Matière Molle
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| Titre : |
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Investigation of shear banding in three-dimensional foams |
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| Auteur(s) : |
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Guillaume Ovarlez ( ) 1, Kapil Krishan 2, 3, Sylvie Cohen-Addad () 2 |
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| Laboratoire : |
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| Équipe de recherche : |
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Rhéophysique |
| Résumé : |
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We study the steady flow properties of different three-dimensional aqueous foams in a wide gap Couette geometry. From local velocity measurements through Magnetic Resonance Imaging techniques and from viscosity bifurcation experiments, we find that these foams do not exhibit any observable signature of shear banding. This contrasts with two previous results (Rodts et al., Europhys. Lett., 69 (2005) 636 and Da Cruz et al., Phys. Rev. E, 66 (2002) 051305); we discuss possible reasons for this dicrepancy. Moreover, the foams we studied undergo steady flow for shear rates well below the critical shear rate recently predicted (Denkov et al., Phys. Rev. Lett., 103 (2009) 118302). Local measurements of the constitutive law finally show that these foams behave as simple Herschel-Bulkley yield stress fluids. |
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Langue du texte
intégral : |
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Anglais |
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Date de production,
écriture : |
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2010 |
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| Journal : |
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Europhysics Letters (EPL) |
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| Audience : |
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internationale |
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| Date de publication : |
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2010 |
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| Volume : |
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91 |
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| Page, identifiant, ... : |
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68005 |
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| Mots Clés : |
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Foams – shear-banding – constitutive law |
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