Abstract
The experiments were performed to determine the permeabilities of hydrogen and deuterium for nickel in the temperature range of 473 to 973 K using the co-current double tube method. The isotope effect ratio in permeation was estimated from these permeabilities. Solubility constants of hydrogen and deuterium for nickel calculated from the permeabilities of this study and the diffusivities of the literature data agreed well with previously reported values. The permeation behavior of hydrogen isotopes in the binary-component hydrogen isotopes system was also observed under various conditions and compared with the values from the model calculation. It is concluded in this study that the separation factor in permeation of hydrogen isotopes through nickel coincides with the isotope effect ratio and that the numerical calculation using the finite difference method is applicable to predict the permeation behavior of hydrogen isotopes through the wall of a long tube for single- and multi-component hydrogen isotopes system.
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