Out-of-contact elastohydrodynamic deformation due to lubrication forces

Abstract

We characterize the spatiotemporal deformation of an elastic film during the radial drainage of fluid from a narrowing gap. Elastic deformation of the film takes the form of a dimple and prevents full contact to be reached. With thinner elastic film the stress becomes increasingly supported by the underlying rigid substrate and the dimple formation is suppressed, which allows the surfaces to reach full contact. We highlight the lag due to viscoelasticity on the surface profiles, and that for a given fluid film thickness deformation leads to stronger hydrodynamic forces than for rigid surfaces.

arXiv comment11 pages, 4 figures

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• Lubricated friction of textured soft substrates
• Electrowetting of a nano-suspension on a soft solid
• Axisymmetric flow due to a Stokeslet near a finite-sized elastic membrane
• Influence of non-hydrodynamic forces on the elastic response of an ultra-thin soft coating under fluid-mediated dynamic loading
• Morphology of soft and slippery contact via fluid drainage
• An electrokinetic route to giant augmentation in load bearing capacity of compliant microfluidic channels
• Effect of an interstitial fluid on the dynamics of three-dimensional granular media
• Elastohydrodynamics of a soft coating under fluid-mediated loading by a spherical probe
• Electroosmotic flow of viscoelastic fluids in deformable microchannels
• Enhancement and Suppression of Active Particle Movement Due to Membrane Deformations