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Stokes–Einstein relation in simple fluids revisited

Khrapak, Sergey (2019) Stokes–Einstein relation in simple fluids revisited. Molecular Physics. Taylor & Francis. DOI: 10.1080/00268976.2019.1643045 ISSN 0026-8976

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Abstract

In this Research Note the Zwanzig’s formulation of the Stokes–Einstein (SE) relation for simple atomistic fluids is re-examined. It is shown that the value of the coefficient in SE relation depends on the ratio of the transverse and longitudinal sound velocities. In some cases, this ratio can be directly related to the pair interaction potential operating in fluids and thus there can be a certain level of predictivity regarding the value of this coefficient. This Research Note provides some evidence in favor of this observation. In particular, analyzing the situation in several model systems such as one-component plasma, Yukawa, inverse-power-law, Lennard-Jones, and hard-sphere fluids, it is demonstrated that there are certain correlations between the interaction softness and the coefficient in SE relation. The SE coefficient is also re-evaluated for various liquid metals at the melting temperature, for which necessary data are available.

Item URL in elib:https://elib.dlr.de/129074/
Document Type:Article
Title:Stokes–Einstein relation in simple fluids revisited
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Khrapak, SergeySergey.Khrapak (at) dlr.deUNSPECIFIED
Date:17 July 2019
Journal or Publication Title:Molecular Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1080/00268976.2019.1643045
Publisher:Taylor & Francis
ISSN:0026-8976
Status:Published
Keywords:diffusion, viscosity, Stokes-Einstein relation, transport properties of simple fluids, collective modes, sound velocity in fluids
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Theory, Simulation
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Khrapak, Sergey
Deposited On:11 Sep 2019 11:40
Last Modified:11 Sep 2019 11:40

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