Elastohydrodynamic lift at a soft wall
arXiv:1711.11378 · doi:10.1103/PhysRevLett.120.198001
Abstract
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.
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- Lift at low Reynolds number
- Lubricated friction of textured soft substrates
- Influence of non-hydrodynamic forces on the elastic response of an ultra-thin soft coating under fluid-mediated dynamic loading
- Lift induced by slip inhomogeneities in lubricated contacts
- Droplet settling on solids coated with a soft layer
- Capillary lubrication of a spherical particle near a fluid interface
- Enhancement and Suppression of Active Particle Movement Due to Membrane Deformations