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arXiv 1703.04522physics.flu-dyncond-mat.mes-hall
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二维不可压缩流体的奇粘性

Odd viscosity in two-dimensional incompressible fluids

Sriram Ganeshan, Alexander G. Abanov

摘要:

在这项工作中,我们提出了不可压缩2+ 1维流体力学宇称破坏奇粘性项的可观察的后果。对于仅取决于速度场(流)的边界条件,我们证明:(i)由速度场量化的流体流动与奇粘度无关,(ii)作用在封闭轮廓上的力与奇粘度无关,以及(iii)闭合轮廓上的扭矩的奇粘度部分与轮廓所包围的面积的变化率成比例,比例常数是奇粘度最后的陈述允许我们定义类似于霍尔电阻测量的{ \it奇粘度}的测量协议。我们还考虑了{ \it无应力}边界条件,明确依赖于奇粘度。无应力边界条件下的经典流体力学问题是平面Stokes流中的气泡问题。我们完全解决这个问题的剪切和双曲流,并表明,剪切流中的气泡的稳态形状明确取决于奇粘度的值。

英文摘要:

In this work, we present observable consequences of parity-violating odd viscosity term in incompressible 2+1D hydrodynamics. For boundary conditions depending on the velocity field (flow) alone we show that: (i) The fluid flow quantified by the velocity field is independent of odd viscosity, (ii) The force acting on a closed contour is independent of odd viscosity, and (iii) The odd viscosity part of torque on a closed contour is proportional to the rate of change of area enclosed by the contour with the proportionality constant being twice the odd viscosity. The last statement allows us to define a measurement protocol of {\it odd viscostance} in analogy to Hall resistance measurements. We also consider {\it no-stress} boundary conditions which explicitly depend on odd viscosity. A classic hydrodynamics problem with no-stress boundary conditions is that of a bubble in a planar Stokes flow. We solve this problem exactly for shear and hyperbolic flows and show that the steady-state shape of the bubble in the shear flow depends explicitly on the value of odd viscosity.

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