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Elastic deformations driven by non-uniform lubrication flows

机译:由不均匀润滑流动驱动的弹性变形

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摘要

The ability to create dynamic deformations of micron-sized structures isrelevant to a wide variety of applications such as adaptable optics, softrobotics, and reconfigurable microfluidic devices. In this work we examinenon-uniform lubrication flow as a mechanism to create complex deformationfields in an elastic plate. We consider a Kirchoff-Love elasticity model forthe plate and Hele-Shaw flow in a narrow gap between the plate and a parallelrigid surface. Based on linearization of the Reynolds equation, we obtain agoverning equation which relates elastic deformations to gradients innon-homogenous physical properties of the fluid (e.g. body forces, viscosity,and slip velocity). We then focus on a specific case of non-uniformHelmholtz-Smoluchowski electroosmotic slip velocity, and provide a method fordetermining the zeta-potential distribution necessary to generate arbitrarystatic and quasi-static deformations of the elastic plate. Extending theproblem to time-dependent solutions, we analyze transient effects onasymptotically static solutions, and finally provide a closed form solution fora Green's function for time periodic actuations.
机译:产生微米级结构的动态变形的能力与广泛的应用相关,例如自适应光学器件,软机器人和可重新配置的微流体设备。在这项工作中,我们研究了非均匀润滑流作为在弹性板上产生复杂变形场的机制。我们考虑了板的Kirchoff-Love弹性模型和板与平行刚性表面之间的狭窄间隙中的Hele-Shaw流动。基于雷诺方程的线性化,我们获得了方程方程,该方程将弹性变形与流体非均匀物理特性(例如体力,粘度和滑移速度)的梯度相关联。然后,我们将重点放在非均匀亥姆霍兹-斯莫卢霍夫斯基电渗滑移速度的特定情况下,并提供一种确定产生弹性板的任意静态和准静态变形所必需的zeta势分布的方法。将问题扩展到与时间有关的解,我们分析了渐近静态解的瞬态效应,最后为格林函数的时间周期激励提供了一种闭式解。

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