Highly elastic fibers in a shear flow can form double helices

A. Słowicka, Nan Xue, Lujia Liu, J. Nunes, Pawel Sznajder, H. A. Stone, M. Ekiel-Jeżewska
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Abstract

The long-time behavior of highly elastic fibers in a shear flow is investigated experimentally and numerically. Characteristic attractors of the dynamics are found. It is shown that for a small ratio of bending to hydrodynamic forces, most fibers form a spinning elongated double helix, performing an effective Jeffery orbit very close to the vorticity direction. Recognition of these oriented shapes, and how they form in time, may prove useful in the future for understanding the time history of complex microstructures in fluid flows and considering processing steps for their synthesis.
剪切流中的高弹性纤维可形成双螺旋
实验和数值研究了高弹性纤维在剪切流中的长期行为。发现了动力学的特征吸引子。研究表明,当弯曲力与流体动力的比率很小时,大多数纤维会形成旋转的拉长双螺旋,在非常靠近涡流方向的地方执行有效的杰弗里轨道。识别这些定向形状以及它们是如何在时间中形成的,将来可能有助于了解流体流动中复杂微结构的时间历史,并考虑合成这些微结构的加工步骤。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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