论文标题
应变诱导的中尺度液体中温度均匀性的侵犯
Strain-Induced Violation of Temperature Uniformity in Mesoscale Liquids
论文作者
论文摘要
热弹性将弹性（固体）体的变形融合到其温度，反之亦然。这是一个坚固的属性。在液体中突出这种特性是一种范式转移：它需要当前液体描述中未考虑的远程集体相互作用。目前的开创性微热研究为这种固体样相关性提供了证据。结果表明，当施加低频（Hz）机械剪切应力时，普通液体会发出调制的热信号。液体在几个小微米宽的热带中分裂，所有液体都同步和分开变化，而所施加的应力波达到了$ \ pm $ 0.2°C的相当大幅度。该热性质在液体中未知。热机械耦合挑战流体动力学的教条：液体统一反应，使其内部能量适应外部剪切应变，并且不受造成即时热量耗散的短暂放松时间的控制。热机械耦合的证明为新一代节能温度转换器开辟了道路。
Thermo-elasticity couples the deformation of an elastic (solid) body to its temperature and vice-versa. It is a solid-like property. Highlighting such property in liquids is a paradigm shift: it requires long-range collective interactions that are not considered in current liquid descriptions. The present pioneering microthermal studies provide evidence for such solid-like correlations. It is shown that ordinary liquids emit a modulated thermal signal when applying a low frequency (Hz) mechanical shear stress. The liquid splits in several tenths microns wide thermal bands, all varying synchronously and separately with the applied stress wave reaching a sizable amplitude of $\pm$ 0.2 °C. This thermal property is unknown in liquids. Thermo-mechanical coupling challenges a dogma in fluid dynamics: the liquid responds collectively, adapts its internal energy to external shear strain and is not governed by short relaxation times responsible of instant thermal dissipation. The proof of thermomechanical coupling opens the way to a new generation of energy-efficient temperature converters.
