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arXiv 2202.07928cond-mat.softcond-mat.mes-hall
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流体粘弹特性的一种新的通用模型:应用于液态水的机械松弛和低频振荡测量

A novel general modeling of the viscoelastic properties of fluids: application to mechanical relaxation and low frequency oscillation measurements of liquid water

Frederic Aitken, Ferdinand Volino

摘要:

本文的目的是计算当处于热力学平衡的流体系统受到机械作用时,流体粒子的平均位置(和取向)的时间依赖性。这种新的理论方法的出发点是引入一个机械能功能。然后使用的惯性模式和作用温度的概念,并假设每个模式的机械能均分原则,该模型预测存在的动态相变的介质的流变行为从固体状发展到液体状政权时,机械作用增加。众所周知的牛顿行为恢复为极限情况。目前的建模应用于最近的液态水粘弹性数据的分析指出一个普遍的弹性行为在受限的几何形状。它表明,该模型使得有可能理解这些数据在一个连贯的和统一的方式与传输特性(粘度和自扩散系数)。它的结论是,任何有限体积的流体在静止时具有静态剪切弹性,因此应被视为固体状介质。

英文摘要:

The aim of this paper is to calculate the time dependence of the mean position (and orientation) of a fluid particle when a fluid system at thermodynamic equilibrium is submitted to a mechanical action. The starting point of this novel theoretical approach is the introduction of a mechanical energy functional. Then using the notions of inertial modes and action temperature, and assuming a mechanical energy equipartition principle per mode, the model predict the existence of a dynamic phase transition where the rheological behavior of the medium evolves from a solid-like to a liquid-like regime when the mechanical action is increased. The well-known Newtonian behavior is recovered as limiting case. The present modeling is applied to the analysis of recent liquid water viscoelastic data pointing out a prevalent elastic behavior in confined geometry. It is demonstrated that the model makes it possible to understand these data in a coherent and unified way with the transport properties (viscosity and self-diffusion coefficient). It is concluded that any finite volume of fluid at rest possesses a static shear elasticity and should therefore be considered as a solid-like medium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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