论文标题
通过机械变形，液态甘油中意外的热弹性作用
Unexpected thermo-elastic effects in liquid glycerol by mechanical deformation
论文作者
论文摘要
通常认为，剪切波不会在液体培养基中传播。剪切波能应瞬时消散。该陈述源于难以进入宏观液体中静态剪切应力的困难。在本文中，我们采用了另一种方法。我们专注于热平衡的稳定性，而液体（甘油）则以亚毫米尺度的突然剪切应变。变形液体的热响应已揭幕。液体表现出约为+0.04°C和-0.04°C温度变化的同时和相对带。突然的热变化不包括传热的可能性，并突出了液体将剪切能存储在不均匀热力学状态的能力。热效应几乎线性地取决于支持剪切波传播（弹性相关性）假设的变形幅度，该假设延伸多达数百个微米。这种新的物理效果可以用限制液体的基本声子物理学来解释，该物理可以揭示出与玻璃系统许多相似性的隐藏固体响应。
It is commonly accepted that shear waves do not propagate in a liquid medium. The shear wave energy is supposed to dissipate nearly instantaneously. This statement originates from the difficulty to access static shear stress in macroscopic liquids. In this paper, we take a different approach. We focus on the stability of the thermal equilibrium while the liquid (glycerol) is submitted to a sudden shear strain at sub-millimetre scale. A thermal response of the deformed liquid is unveiled. The liquid exhibits simultaneous and opposite bands of about +0.04 °C and -0.04 °C temperature variations. The sudden thermal changes exclude the possibility of heat transfer and highlight the ability of the liquid to store the shear energy in non-uniform thermodynamic states. The thermal effects depend nearly linearly on the amplitude of the deformation supporting the hypothesis of a shear wave propagation (elastic correlations) extending up to several hundreds microns. This new physical effect can be explained in terms of the underlying phonon physics of confined liquids, which unveils a hidden solid-like response with many similarities to glassy systems.
