Abstract
The density and temperature dependences of the shear viscosity of liquid potassium and cesium are studied. The stress autocorrelation function is calculated from equilibrium molecular dynamics simulations. Using the Green-Kubo formula, the shear viscosity is obtained. Interionic interactions are calculated by Fiolhais potential and are validated by comparison between simulation and experimental data along the liquid-gas coexistence curve for K and Cs. For both metals, three isochors and one isotherm are investigated. The recently proposed relation in [Phys. Rev. B 93 , 214203 (2016)] is tested in the cases of K and Cs and it appears that this function reproduces qualitatively and quantitatively well the behavior of each element.
Highlights
In our recent article [1], the density and temperature dependences of the shear viscosity of liquid sodium were studied
An expression was proposed for the viscosity as a function of temperature and density which reproduced our data for liquid sodium at any density in the range [1000; 2000 kg.m−3] and any temperature in the range [700; 7000 K]
Sodium is one of the alkali metals and it was reported that several properties such as the diffusion coefficient have an universal behavior among these metals
Summary
In our recent article [1], the density and temperature dependences of the shear viscosity of liquid sodium were studied. Sodium is one of the alkali metals and it was reported that several properties such as the diffusion coefficient have an universal behavior among these metals. In this spirit, potassium and cesium are studied. There are little or no experimental measurements of transport properties in the literature, even near the triple point. Adding to this difficulty, an increase of the density makes measurements very impractical to do. Prediction of these properties using numerical simulation appears to be an interesting alternative to the experimental determination
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