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arXiv 1302.2287cond-mat.soft
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主动弹性膜的流体输送

Fluid transport by active elastic membranes

Arthur A. Evans, Eric Lauga

摘要:

随着时间的推移而变形的柔性膜可以在粘性流体中自推进。或者,如果膜被锚定,其变形将导致流体输送。过去在这方面的工作集中在膜的变形运动学的规定的情况下。在这里,我们考虑的模型中,膜的变形是没有规定的,而是膜内部被迫。随时间变化的膜形状和由此产生的流体运动都是由规定的内部主动应力、内部被动阻力和外部粘性应力之间的平衡引起的。我们介绍了两个具体的模型,这样的主动内部强迫:一个是主动弯矩的分布是规定的,和一个主动夹杂物施加法向应力的膜通过泵送流体通过it.In每一种情况下,我们渐近计算膜的形状和流体输运速度为小强迫振幅,并恢复我们的结果使用缩放分析。

英文摘要:

A flexible membrane deforming its shape in time can self-propel in a viscous fluid. Alternatively, if the membrane is anchored, its deformation will lead to fluid transport. Past work in this area focused on situations where the deformation kinematics of the membrane were prescribed. Here we consider models where the deformation of the membrane is not prescribed, but instead the membrane is internally forced. Both the time-varying membrane shape, and the resulting fluid motion, result then from a balance between prescribed internal active stresses, internal passive resistance, and external viscous stresses. We introduce two specific models for such active internal forcing: one where a distribution of active bending moments is prescribed, and one where active inclusions exert normal stresses on the membrane by pumping fluid through it. In each case, we asymptotically calculate the membrane shape and the fluid transport velocities for small forcing amplitudes, and recover our results using scaling analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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