Shear Viscosity of Liquid Potassium and Cesium: a Simulation Study

Meyer, Nadège; Xu, Hòng; Wax, J.-F.

doi:10.1051/epjconf/201715104001

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…In a series of articles [6][7][8], we investigated the behaviour of the viscosity of liquid alkali metals over a wide pressure and temperature range of their phase diagram. We have been able to show that the viscosity of liquid alkali metals has a universal dependence on temperature and density.…”

Section: Introductionmentioning

confidence: 99%

Viscosity of liquid Na–K alloys from molecular dynamics simulations

Becker¹,

Meyer²,

Xu³

et al. 2020

J. Phys.: Condens. Matter

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The shear viscosity of liquid Na-K alloys is computed from molecular dynamics simulations using the Green-Kubo formalism. Interatomic interactions are described using effective pair potentials obtained from Fiolhais pseudo-potential and self-consistent screening. The composition dependence of the viscosity is first investigated at 373 K, then its temperature dependence at three different compositions, namely Na 10 -K 90 , Na 50 -K 50 , and Na 90 -K 10 . Simulation results are first compared with available experimental data. The evolution of the viscosity of the alloys versus temperature is similar to that of a pure one component fluid. This is discussed in connection with the chemical order of the mixtures.

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Section: Introductionmentioning

confidence: 99%

Viscosity of liquid Na–K alloys from molecular dynamics simulations

Becker¹,

Meyer²,

Xu³

et al. 2020

J. Phys.: Condens. Matter

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“…Interested reader is kindly asked to refer to our previous studies for a detailed description of the phase diagrams. We will extend this previous study to the case of the other alkali metals Li, K, Rb, and Cs [10][11]. For these metals, we will consider two isochoric lines, namely ρ = ρm and ρ = 1.5 ρm, up to very high temperatures (7000 K).…”

mentioning

confidence: 99%

Stokes-Einstein Relation in Pure Alkali Metals and their Alloys

Wax

Harchaoui

2022

DDF

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Stokes-Einstein relation is a convenient way to evaluate diffusion properties in liquids from viscosity results (and vice-versa). However, the accuracy of this relation in the case of atomic fluids is often debated as it was initially established in the case of a big Brownian particle immersed in a fluid. Especially, the question is raised to properly define the hydrodynamic radius entering the formula, as well as the constant depending on the boundary conditions at the surface of the particle. In this study, we use our results of viscosity and self-diffusion coefficient obtained by molecular dynamics simulations in the case of alkali metals and their alloys to evaluate the applicability of Stokes-Einstein relation in the case of these liquids. In the case of pure metals, its validity is discussed over a wide range of thermodynamic states, from ambient pressure up to several gigapascals. In the case of alloys, the evolution of its accuracy as a function of temperature and composition is considered. Both definitions of hydrodynamic radius and boundary conditions constant are examined.

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The role of chemical order in the temperature and composition dependence of the viscosity of liquid alloys

Meyer

Wax

2019

The Journal of Chemical Physics

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The influence of the chemical order on the viscosity of liquid alloys is investigated by numerical simulation of molecular dynamics. The temperature and composition dependence is discussed in the case of two contrasting alloys: K-Cs and Li-Bi. These two mixtures have different chemical orders, the first one being random and the second one having strong heterocoordination tendencies. In the case of K-Cs, the behavior of the mixture vs temperature is similar to a pure system and its viscosity varies monotonically with the composition. It is not the case for Li-Bi due to its marked chemical order and the heterocoordination tendency is accompanied by a maximum of the viscosity of the mixture when the composition is changed. For the first time, estimates of the temperature dependence of the viscosity of three representative Li-Bi alloys are given.

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Shear Viscosity of Liquid Potassium and Cesium: a Simulation Study

Cited by 4 publications

References 15 publications

Viscosity of liquid Na–K alloys from molecular dynamics simulations

Viscosity of liquid Na–K alloys from molecular dynamics simulations

Stokes-Einstein Relation in Pure Alkali Metals and their Alloys

The role of chemical order in the temperature and composition dependence of the viscosity of liquid alloys

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