Deuterium gas-driven permeation in different rate-controlled regimes for ITER diagnostic first wall material
Source abstract
Abstract
The evaluation of hydrogen isotope permeation in ITER diagnostic first wall materials (316L(N)-IG) is critical for tritium safety. Most gas-driven permeation (GDP) experiments use thin samples to obtain the experimental data. Thus it necessitates clarification of thickness effect. Deuterium GDP experiments on SS 316L membranes revealed a transition from diffusion- to surface-controlled regimes as thickness decreased. Thin membrane exhibited longer time lag and lower steady-state fluxes compared with thicker one due to the dynamic equilibrium of dissociation and recombination fluxes, confirmed by COMSOL simulations. Using dynamic equilibrium boundary condition for thick materials may misestimate permeation flux because of the sacttered surface relevant parameters, highlighting the need for appropriate boundary condition and hydrogen isotope transport parameter selection.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Nuclear reactor physics and engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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