Isotopic Approximation to Ordinary Diffusion Coefficients in Multi-component Mixture
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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, <SUP>234</SUP>UF<SUB>6<SUP>-</SUP></SUB><SUP>235</SUP>UF<SUB>6<SUP>-</SUP></SUB><SUP>236</SUP>UF<SUB>6<SUP>-</SUP></SUB><SUP>236</SUP>UF<SUB>6</SUB>, 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.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 34(3), 318-324, 1997-03-25
Atomic Energy Society of Japan