论文标题

非隔离电驱动流体

Non-dissipative electrically driven fluids

论文作者

Amoretti, Andrea, Brattan, Daniel K., Martinoia, Luca, Matthaiakakis, Ioannis

论文摘要

现有的充电流体的流体动力学模型将作用在流体上的任何外部电场视为流体动力衍生物扩张中的第一阶,并且完全任意或零阶,但受流体的化学潜力限制。这是对电荷流体进行的实验的张力,在充电的流体上,电场既是零阶,又是完全任意的。在这项工作中,我们通过引入新的流体动力固定状态(包括任意的零体订单电场)来解决这一难题的第一步,可以在其中建立流体动力学。我们通过首先写下为衍生物中的一阶式电荷流体写下静静力组成关系。然后,我们引入合适的能量和动量松弛项,以平衡电场对流体的影响。该分析导致对空间流体速度的新静静力限制,可用于定义我们的状态类别。该约束将流体动力学领域推广到对电子传输模型中的速度的相似约束。我们的一类状态即使以理想的顺序也表现出非平凡的热电运输,因为它具有非零的直流电流和热电流。我们得出相应电导率的明确形式,并表明它们非线性地依赖于电场。

Existing hydrodynamic models of charged fluids consider any external electric field acting on the fluid as either first order in the hydrodynamic derivative expansion and completely arbitrary or zeroth order but constrained by the fluid's chemical potential. This is in tension with experiments on charged fluids, where the electric field is both zeroth order and completely arbitrary. In this work, we take the first step at resolving this conundrum by introducing a new class of hydrodynamic stationary states, including an arbitrary zeroth order electric field, upon which hydrodynamics can be built. We achieve this by first writing down the hydrostatic constitutive relations for a boost-agnostic charged fluid up to first order in derivatives. Then we introduce suitable energy and momentum relaxation terms to balance the influence of the electric field on the fluid. This analysis leads to a new hydrostatic constraint on the spatial fluid velocity, which can be used to define our class of states. This constraint generalizes to the realm of hydrodynamics a similar constraint on the velocity found in the Drude model of electronic transport. Our class of states exhibits non-trivial thermo-electric transport even at ideal order, since it hosts non-zero DC electric and heat currents. We derive the explicit form of the corresponding conductivities and show they depend non-linearly on the electric field.

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