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arXiv 2112.03076physics.flu-dyncond-mat.mes-hallcond-mat.soft
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宇称奇三维流体的Hele-Shaw流

Hele-Shaw flow for parity odd three-dimensional fluids

Dylan Reynolds, Gustavo M. Monteiro, Sriram Ganeshan

AI总结:

本文从无各向同性的宇称破缺粘度张量出发,推导了Darcy's law的推广形式,揭示了宇称奇流体在Hele-Shaw实验中的横向力、远场环流及界面稳定效应,为测量活性物质系统的宇称奇系数提供了途径。

摘要:

Hele-Shaw cell是一种用于研究两块平行板之间(由微小间隙隔开)流体流动的装置。Hele-Shaw cell内流动的支配方程是Darcy's law,该定律也描述了多孔介质中的流动。在这项工作中,我们从具有无各向同性的宇称破缺粘度张量的三维流体出发,推导出了Darcy's law的推广形式。我们讨论了在与Hele-Shaw实验相关的各种物理设置中宇称奇流体的可观察效应,如通道流、绕过障碍物的流动、气泡动力学和Saffman-Taylor不稳定性。特别地,我们证明了当这种流体被推过通道时,会对壁面施加横向力;而当空气气泡膨胀进入这种流体区域时,远场会产生环流,这两种效应均与宇称奇粘度系数成正比。Saffman-Taylor稳定性条件也被修改,这些项倾向于使双流体界面稳定。原则上,此类实验有助于测量合成和天然活性物质系统中的宇称奇系数。

英文摘要:

A Hele-Shaw cell is a device used to study fluid flow between two parallel plates separated by a small gap. The governing equation of flow within a Hele-Shaw cell is Darcy's law, which also describes flow through a porous medium. In this work, we derive a generalization to Darcy's law starting from a three-dimensional fluid with a parity-broken viscosity tensor with no isotropy. We discuss the observable effects of parity-odd fluids in various physical setups relevant to Hele-Shaw experiments, such as channel flow, flow past an obstacle, bubble dynamics, and the Saffman-Taylor instability. In particular, we show that when such a fluid is pushed through a channel, a transverse force is exerted on the walls, and when a bubble of air expands into a region of such fluid, a circulation develops in the far field, with both effects proportional to the parity-odd viscosity coefficients. The Saffman-Taylor stability condition is also modified, with these terms tending to stabilize the two-fluid interface. Such experiments can in principle facilitate the measurement of parity-odd coefficients in both synthetic and natural active matter systems.

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