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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.25: Poster

Montag, 26. Februar 2024, 16:30–18:30, ELP 6: Foyer

Stokes-Einstein Relation for Binary Mixtures — •Yang Liu and Dietmar Block — IEAP, Christian-Albrechts-Universität, D-24098 Kiel, Germany

The Stokes-Einstein (SE) relation connects the diffusion coefficient (D) of Brownian particles in liquids to their temperature (T) and the shear viscosity (η) [1]. Extensive evidence has confirmed the validity of the SE relation in ordinary liquids and dusty plasmas, except for systems near the melting temperature and for the gaseous behavior [2]. However, for binary mixtures, i.e. dusty plasmas consisting of two particle species with different charges, an explicit validation of SE is lacking.

In this paper, a Langevin simulation code is used to generate 2D binary systems whose structural and dynamical properties match the experimental conditions [3]. The obtained η and D in monodisperse and binary systems are analyzed and compared. Finally, the applicability of the SE relation to 2D finite binary mixtures is tested. Our results show that, even in finite systems the SE relation holds. Further, the transport properties of monodisperse and binary systems can be combined in a generalized SE relation if properly defined coupling strengths and screening parameters are used.

References

[1] A. Einstein, Investigations on the Theory of the Brownian Movement (Courier Corporation, 1956).

[2] N. Ohtori, et al., Phys. Rev. E 95 (2017) 052122.

[3] F. Wieben, et al., Phys. Plasmas 24 (2017) 033707.

Keywords: binary mixtures; Stokes-Einstein (SE) relation; Langevin simulation; boundary conditions; transport properties