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Molecular Modeling of the Thermal Accommodation of Argon Atoms on Clusters of Iron Atoms

  • THERMOPHYSICAL PROPERTIES OF MATERIALS
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Abstract

The interaction of a flow of argon atoms at a temperature of 300 K with clusters of iron atoms is studied at a cluster temperature of 500 to 2500 K. The amount of energy acquired by the argon atom increases, and the thermal-accommodation coefficient decreases according to the Arrhenius law with increasing cluster temperature. The relationship between the coefficient of thermal accommodation and the time of interaction of the incident atom with the cluster is revealed. The heat-transfer coefficient is calculated. The dependences of the thermal-accommodation coefficient and the amount of energy received by an atom on the number of atoms N in the cluster turned out to be linear along N–1/3. The method of molecular dynamics is applied. The model consists of a cluster and one incident atom; the trajectories of the incident atom are calculated. The amount of energy produced by an atom and the coefficient of thermal accommodation are found from a comparison of the initial and final velocities of the incident atom. To simulate the flow, 10 to 300 000 trajectories of the incident atom are averaged with respect to the cluster size.

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ACKNOWLEDGMENTS

The authors thank V.Ya. Rudyak for valuable comments on the heat-transfer coefficient. We thank the reviewer for the comments, the consideration of which prompted us to expand and better present the results of the work.

Funding

The article was prepared in the framework of grant no. RNF-17-79-20 391 (D.Yu. Lenev, sections Model, Temperature Dependence and Influence of cluster size), the Basic Research Program of the National Research University Higher School of Economics (HSE), and with funds for the state support of the leading universities of the Russian Federation, “5-100” (G.E. Norman, sections Introduction, Calculation method and Heat coefficient).

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Authors and Affiliations

  1. Moscow Institute of Physics and Technology, 141701, Moscow, Russia

    D. Yu. Lenev

  2. Joint Institute for High Temperatures, Russian Academy of Sciences, 125412, Moscow, Russia

    D. Yu. Lenev & G. E. Norman

  3. National Research University Higher School of Economics, 101000, Moscow, Russia

    G. E. Norman

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  1. D. Yu. Lenev
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  2. G. E. Norman
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Correspondence to D. Yu. Lenev.

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Lenev, D.Y., Norman, G.E. Molecular Modeling of the Thermal Accommodation of Argon Atoms on Clusters of Iron Atoms. High Temp 57, 490–497 (2019). https://doi.org/10.1134/S0018151X19040151

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  • DOI: https://doi.org/10.1134/S0018151X19040151

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