Isotopic Approximation to Ordinary Diffusion Coefficients in Multi-component Mixture.

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  • KOBAYASHI Noboru
    Department of Nuclear Engineering Faculty of Engineering Nagoya University
  • YAMAMOTO Ichiro
    Department of Nuclear Engineering Faculty of Engineering Nagoya University

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  • Isotopic Approximation to Ordinary Diff

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Abstract

By making use of the isotope approximation; neglecting squares of relative mass differences among the isotopes, the authors derived analytically approximations to ordinary diffusion coefficients in a 3- and 4- component isotope mixture. Moreover, approximations to multi-component diffusion coefficients were given on the analogy of those to the 3- and 4-component coefficients, and these approximations were verified to satisfy constrains on the exact ordinary diffusion coefficients. <BR>For 4-component mixture of uranium hexafluoride isotopes, 234UF6-235UF6-236UF6-236UF6, composition dependences of the approximation were equal to those of the exact diffusion coefficients. In addition, relative errors between the exact and the approximations were less than 0.2% for 5-component mixture of krypton 80-82-83-84-86 isotopes.

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