Elastohydrodynamic lift at a soft wall
Résumé
We study experimentally the motion of non-deformable microbeads in a linear shear flow close to a wall bearing a thin and soft polymer layer. Combining microfluidics and 3D optical tracking, we demonstrate that the steady-state bead/surface distance increases with the flow strength. Moreover, such lift is shown to result from flow-induced deformations of the layer, in quantitative agreement with theoretical predictions from elastohydrodynamics. This study thus provides the first experimental evidence of ``soft lubrication'' at play at small scale, in a system relevant {\it e.g.} to the physics of blood microcirculation.
Domaines
Matière Molle [cond-mat.soft]| Origine | Fichiers produits par l'(les) auteur(s) |
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