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TVT, 2018, Volume 56, Issue 2, Pages 211–218 (Mi tvt10801)  

Thermophysical Properties of Materials

Viscosity of cobalt melt: Experiment, simulation, and theory

R. M. Khusnutdinoffa, A. V. Mokshina, A. L. Bel'tyukovb, N. V. Olyaninab

a Kazan (Volga Region) Federal University
b Physical-Technical Institute of the Ural Branch of the Russian Academy of Sciences

Abstract: The results of experimental measurements, molecular dynamics simulation, and theoretical calculations of the viscosity of a cobalt melt in a temperature range of $1400$$2000$ K at a pressure $p = 1.5$ bar corresponding to an overcooled melt at temperatures of $1400$$1768$ K and an equilibrium melt with temperatures from the range $1768$$2000$ K are presented. Theoretical expressions for the spectral density of the timedependent correlation function of the stress tensor S̃$(\omega)$ and kinematic viscosity $\nu$; determined from the frequency and thermodynamic parameters of the system are obtained. The temperature dependences of the kinematic viscosity for the cobalt melt are determined experimentally by the torsional oscillation method; numerically, based on molecular simulation data with the EAM potential via subsequent analysis of the time correlation functions of the transverse current in the framework of generalized hydrodynamics; and by the integral Kubo–Green relation; they were also determined theoretically with the Zwanzig–Mori memory functions formalism using a self-consistent approach. Good agreement was found between the results of theoretical calculations for the temperature dependence of the kinematic viscosity of the cobalt melt using experimental data and the molecular dynamics simulation results. From an analysis of the temperature dependence of the viscosity, we obtain an activation energy of $E = (5.38 \pm 0.02) \times 10^{-20}$ J.

Funding Agency Grant Number
Ministry of Education and Science of the Russian Federation 3.2166.2017/4.6
This work was supported by the Ministry of Eduction and Science of the Russian Federation via Kazan State University in the framework of the task 3.2166.2017/4.6.

Author to whom correspondence should be addressed

DOI: https://doi.org/10.7868/S0040364418020072

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English version:
High Temperature, 2018, 56:2, 201–207

Bibliographic databases:

UDC: 536.4; 541.1
Received: 23.12.2016
Accepted:28.06.2017

Citation: R. M. Khusnutdinoff, A. V. Mokshin, A. L. Bel'tyukov, N. V. Olyanina, “Viscosity of cobalt melt: Experiment, simulation, and theory”, TVT, 56:2 (2018), 211–218; High Temperature, 56:2 (2018), 201–207

Citation in format AMSBIB
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