A Numerical Study on the Validity of the Local Equilibrium Hypothesis in Modeling Hydrogen Thermal Desorption Spectra

Ken-ichi Ebihara; Hideo Kaburaki; Tomoaki Suzudo; Kenichi Takai

doi:10.2355/isijinternational.49.1907

Regular Article

A Numerical Study on the Validity of the Local Equilibrium Hypothesis in Modeling Hydrogen Thermal Desorption Spectra

Ken-ichi Ebihara, Hideo Kaburaki, Tomoaki Suzudo, Kenichi Takai

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Keywords: thermal desorption analysis, hydrogen state, local equilibrium, hydrogen diffusion, numerical simulation

JOURNAL FREE ACCESS

2009 Volume 49 Issue 12 Pages 1907-1913

DOI https://doi.org/10.2355/isijinternational.49.1907

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Abstract

We present a systematic benchmark study on different numerical models for analyzing hydrogen thermal desorption spectra, by focusing on the adoption of the local equilibrium hypothesis in these models. We find that the direct numerical method of the full set of the extended mass conservation equations is only able to predict the experimental behavior of thermal desorption spectra for pure iron in the thin specimen limit, while other models incorporating the local equilibrium hypothesis fail to predict this behavior.

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