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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Visualization of the spatiotemporal elastohydrodynamic deformation of a compliant thin film under confinement
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APS -APS March Meeting 2017 - Event - Visualization of the spatiotemporal elastohydrodynamic deformation of a compliant thin film under confinement

机译：APS -APS 2017年3月会议-活动-封闭状态下顺应薄膜的时空弹性流体动力变形的可视化

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Interfacial phenomena in soft matter display complex mesoscale behaviors that are qualitatively different from those encountered in stiff materials. Elastohydrodynamic deformation can cause lift and reduce friction during sliding and alter the rheological properties of colloidal particles. Elastohydrodynamic deformation also modifies the shape of approaching surfaces, a determining factor for the adhesion dynamics to wet or flooded surfaces. It is a challenge to measure simultaneously the hydrodynamic forces and the deformation, both necessary to understand how contact is reached and the coupling between deformation and viscous dissipation. ewlineWe will discuss the spatiotemporal deformation of an elastic film during the radial drainage of fluid from a narrowing gap. We observe that the elastic deformation of a thick film takes the form of a dimple and prevents full contact to be reached. With thin 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. For intermediate film thickness we observe shapes that are much more complex. We present a theoretical description that captures the effect of the film thickness on the elastic deformation and highlight the lag due to viscoelasticity.
机译：软物质中的界面现象显示出复杂的中尺度行为，该行为在质上与硬质材料中遇到的行为不同。弹性流体动力变形可引起升力并减少滑动过程中的摩擦，并改变胶体颗粒的流变性。弹性流体动力学变形还改变了接近表面的形状，这是湿润或溢流表面的粘附动力学的决定因素。同时测量流体动力和变形是一个挑战，这对于理解如何达到接触以及变形和粘性耗散之间的耦合都是必需的。我们将讨论在从狭窄的缝隙径向排出流体的过程中弹性膜的时空变形。我们观察到，厚膜的弹性变形为凹痕形式，并阻止了完全接触。对于薄的弹性膜，应力越来越多地被下面的刚性基板支撑，并且抑制了凹坑的形成，这允许表面达到完全接触。对于中等厚度的膜，我们观察到的形状要复杂得多。我们提出了一个理论描述，该描述描述了膜厚度对弹性变形的影响，并强调了由于粘弹性引起的滞后。

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