Perspectives on viscoelastic flow instabilities and elastic turbulence
Perspectives on viscoelastic flow instabilities and elastic turbulence
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DOI：
10.1103/physrevfluids.7.080701
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发表时间：
2022-08-29
影响因子：
2.7
通讯作者：
Stone, Howard A.
中科院分区：
文献类型：
--
作者：
Datta, Sujit S.;Ardekani, Arezoo M.;Stone, Howard A.
粘弹性流体是流变学复杂材料的一个常见子类，在从生物学到聚合物加工的各个领域都遇到过。在普通牛顿流体稳定的情况下，由于弹性应力和粘性应力的非线性耦合，可见共弹性流体的流动往往是不稳定的。也许更令人惊讶的是，不稳定性产生了具有许多湍流特征的流动——即使有效雷诺数可能是0(1)或更小。我们通过整合最近一次国际研讨会上演讲者的输入，提供粘弹性流动不稳定性的观点：历史评论，流体和流动的特征，实验和模拟工具的讨论，以及激发这一迷人主题进一步研究的现代问题和困惑。这里的材料将对研究人员和教育工作者都很有用，特别是当这个主题在工程和科学的基础理解和应用方面不断发展时。
Viscoelastic fluids are a common subclass of rheologically complex materials that are encountered in diverse fields from biology to polymer processing. Often the flows of vis-coelastic fluids are unstable in situations where ordinary Newtonian fluids are stable, owing to the nonlinear coupling of the elastic and viscous stresses. Perhaps more surprisingly, the instabilities produce flows with many of the hallmarks of turbulence-even though the ef-fective Reynolds numbers may be O(1) or smaller. We provide perspectives on viscoelastic flow instabilities by integrating the input from speakers at a recent international workshop: historical remarks, characterization of fluids and flows, discussion of experimental and simulation tools, and modern questions and puzzles that motivate further studies of this fascinating subject. The materials here will be useful for researchers and educators alike, especially as the subject continues to evolve in both fundamental understanding and applications in engineering and the sciences.