Dissipative versus reversible contributions to macroscopic dynamics: the role of time-reversal symmetry and entropy production
Dissipative versus reversible contributions to macroscopic dynamics: the role of time-reversal symmetry and entropy production
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DOI：
10.1007/s00397-018-1112-x
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发表时间：
2018-12-01
期刊：
影响因子：
2.3
通讯作者：
Svensek, Daniel
中科院分区：
文献类型：
--
作者：
Brand, Helmut R.;Pleiner, Harald;Svensek, Daniel
讨论了液晶系统中不同流体动力自由度间动态交叉耦合的时间反转行为。使用包括线性不可逆热力学在内的标准流体力学描述，我们表明可逆和不可逆耦合的不同热力学要求导致了实验可达的差异。我们批判性地比较了我们的描述与那些现有的标准连续介质力学理论，其中时间反转对称性没有充分调用。动机来自最近的实验进展，允许区分流体力学描述和连续介质力学方法。本文研究了手性液晶中lehmann型效应的动力学，以及铁磁系和铁磁向列系中液体多铁性系统的动态磁电响应。此外，我们还讨论了时间反转对称性对向列（或预过渡向列域）中指向器的流动排列以及纹理向列液晶中动态热-机械和机电耦合的影响。
We discuss the time-reversal behavior of dynamic cross-couplings among various hydrodynamic degrees of freedom in liquid crystal systems. Using a standard hydrodynamic description including linear irreversible thermodynamics, we show that the distinct thermodynamic requirements for reversible and irreversible couplings lead to experimentally accessible differences. We critically compare our descriptions with those of existing standard continuum mechanics theories, where time-reversal symmetry is not adequately invoked. The motivation comes from recent experimental progress allowing to discriminate between the hydrodynamic description and the continuum mechanics approach. This concerns the dynamics of Lehmann-type effects in chiral liquid crystals and the dynamic magneto-electric response in ferronematics and ferromagnetic nematics, a liquid multiferroic system. In addition, we discuss the consequences of time-reversal symmetry for flow alignment of the director in nematics (or pretransitional nematic domains) and for the dynamic thermo-mechanical and electro-mechanical couplings in textured nematic liquid crystals.