Molecular-level description of temperature and pressure effects on the viscosity of water
Molecular-level description of temperature and pressure effects on the viscosity of water
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DOI：
10.1063/1.480367
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发表时间：
1999-12-08
影响因子：
4.4
通讯作者：
Robinson, GW
中科院分区：
文献类型：
--
作者：
Cho, CH;Urquidi, J;Robinson, GW
水的剪切粘度在低温下的陡峭的非阿耳忒弥斯温度依赖性和它在低于33摄氏度的温度下在压力下的向后听起来增加的流动性是这种液体的两个异常，这已经知道了很长一段时间。本论文的目的是显示如何从一个明确的两态外邻混合模型，我们已经用来解释这种物质的许多其他属性的水的这两个重要特性出现定量。它将在这里示出，这两个粘度异常是直接相关的陡峭的变化与温度和压力的冰Ih型键合和冰II型键合在两个状态的混合物的分数组成。这种成分依赖性已经在早期的工作中从水的密度和等温压缩性随温度的变化中得到。因此，这里提出的粘度分析有助于进一步统一在一个单一的，非常简单的结构特征下，这种液体的所有性质。(C)1999年美国物理学会。[S0021-9606（99）51246-4]。
The steep non-Arrhenius temperature dependence at low temperatures of the shear viscosity of water and its backwards-sounding increased fluidity under pressure for temperatures below 33 degrees C are two of the anomalies of this liquid that have been known for a very long time. The purpose of the present paper is to show how these two important characteristics of water emerge quantitatively from an explicit two-state outer-neighbor mixture model that we have used to explain many other properties of this substance. It will be shown here that both of these viscosity anomalies are directly related to the steep variations with temperature and pressure of the fractional compositions of ice-Ih-type bonding and ice-II-type bonding in the two-state mixture. This compositional dependence has already been obtained in earlier work from the variations of the density and the isothermal compressibility of water with temperature. The viscosity analysis presented here thus helps to unify further all the properties of this liquid under a single, very simple structural characteristic. (C) 1999 American Institute of Physics. [S0021-9606(99)51246-4].