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Maxwell-Stefan Diffusion And Dynamical Correlation In Molten LiF-KF: A Molecular Dynamics Study

Jain, Richa Naja and Chakraborty, Brahmananda and Ramaniah, Lavanya M (2016) Maxwell-Stefan Diffusion And Dynamical Correlation In Molten LiF-KF: A Molecular Dynamics Study. In: DAE Solid State Physics Symposium, DEC 21-25, 2015, Amity Univ, Noida, INDIA.

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Official URL: http://dx.doi.org/10.1063/1.4948034

Abstract

In this work our main objective is to compute Dynamical correlations, Onsager coefficients and Maxwell-Stefan (MS) diffusivities for molten salt LiF-KF mixture at various thermodynamic states through Green-Kubo formalism for the first time. The equilibrium molecular dynamics (MD) simulations were performed using BHM potential for LiF-KF mixture. The velocity autocorrelations functions involving Li ions reflect the endurance of cage dynamics or backscattering with temperature. The magnitude of Onsager coefficients for all pairs increases with increase in temperature. Interestingly most of the Onsager coefficients has almost maximum magnitude at the eutectic composition indicating the most dynamic character of the eutectic mixture. MS diffusivity hence diffusion for all ion pairs increases in the system with increasing temperature. Smooth variation of the diffusivity values denies any network formation in the mixture. Also, the striking feature is the noticeable concentration dependence of MS diffusivity between cation-cation pair, DLi-K which remains negative for most of the concentration range but changes sign to become positive for higher LiF concentration. The negative MS diffusivity is acceptable as it satisfies the non-negative entropy constraint governed by 2nd law of thermodynamics. This high diffusivity also vouches the candidature of molten salt as a coolant.

Item Type: Conference Proceedings
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 30 Aug 2016 09:42
Last Modified: 30 Aug 2016 09:42
URI: http://eprints.iisc.ac.in/id/eprint/54523

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