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arXiv 2203.04646cond-mat.soft
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普通水的剪切粘度与自扩散

The shear viscosity and self-diffusion in ordinary water

Viktor N. Makhlaichuk, Nikolay P. Malomuzh

摘要:

本文详细分析了液态水从三相点到临界点的两个重要输运过程--运动剪切粘度和自扩散。我们的方法的剪切粘度是接地之间的两个最近的分子层移动相对于彼此的摩擦效应。在这种关系中,水中剪切粘度的性质与氩中剪切粘度的性质完全相似。的贡献,所造成的层间位移的分子,被认为是微不足道的小。本文详细研究了水的运动剪切粘度在汽液共存曲线和等温线两个特征方向上的行为。对于氩气,我们认为自扩散是由纳米尺度涡旋流体动力学模式的分子输运和分子尺度上的集体混合两个主要贡献形成的。第二种类型的机制是具有良好的准确性所描述的爱因斯坦公式与硬核半径的分子确定从分析的剪切粘度的水。

英文摘要:

The paper is devoted to a detailed analysis of the two important transport processes - the kinematic shear viscosity and the self-diffusion - for all states of liquid water from the triple point to the critical point. Our approach to the shear viscosity is grounded on friction effects between the two nearest molecular layers shifting relative to each other. In this relation, the nature of the shear viscosity in water is fully similar to that in argon. The contribution, caused by interlayer displacements of molecules, is assumed to be negligibly small. The behavior of the kinematic shear viscosities of water is investigated in detail in the two characteristic directions: the vapor-liquid coexistence curve and isotherms. As for argon, it is assumed that the self-diffusion in water is formed by the two main contributions, caused by the molecular transport by nano-scale vortex hydrodynamic modes and collective intermixing of molecules on molecular scales. The mechanism of the second type is with good accuracy described by the Einstein formula with a hard-core radius of a molecule determined from analysis of the shear viscosity of water.

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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