Viscosity of particulate soap films : approaching the jamming of 2D capillary suspensions

Yousra Timounay (1) , Florence Rouyer (1)

1 navier umr 8205 - Laboratoire Navier

We compute the effective viscosity of particulate soap films thanks to local velocity fields obtained by Particle Image Velocimetry (PIV) during film retraction experiments. We identify the jamming of these 2D capillary suspensions at a critical particle surface fraction (0.84) where effective viscosity diverges. Pair correlation function and number of neighbors in contact or close to contact reveal the cohesive nature of this 2D capillary granular media. The experimental 2D dynamic viscosities can be predicted by a model considering viscous dissipation at the liquid interfaces induced by the motion of individual particles.

We compute the effective viscosity of particulate soap films thanks to local velocity fields obtained by Particle Image Velocimetry (PIV) during film retraction experiments. We identify the jamming of these 2D capillary suspensions at a critical particle surface fraction ([similar, equals]0.84) where effective viscosity diverges. Pair correlation function and number of neighbors in contact or close to contact reveal the cohesive nature of this 2D capillary granular media. The experimental 2D dynamic viscosities can be predicted by a model considering viscous dissipation at the liquid interfaces induced by the motion of individual particles.

Mots clés: PARTICULATE FILM; VISCOSITY; 2D SUSPENSION; INTERFACIAL VISCOSITY

Mots clés: PARTICULE; VISCOSITE; SUSPENSION CHIMIQUE; LIQUIDE

Domaines: Milieux fluides et réactifs

Yousra Timounay, Florence Rouyer. Viscosity of particulate soap films : approaching the jamming of 2D capillary suspensions. Soft Matter, 2017, 13 (18), pp. 3449-3456. ⟨10.1039/C7SM00090A⟩. ⟨hal-01634898⟩