Hydrogen gas-driven permeation through the membrane with asymmetric surface conditions

Писарев, А. А.

doi:10.1016/j.memsci.2009.02.041

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…is large (W > 100) on both sides of the bare Eurofer membrane [24,25]. Here, p is the upstream pressure of the hydrogen gas, while S and D are the Eurofer solubility and diffusivity coefficients for the hydrogen in the Eurofer substrate.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen permeation through silicon nitride films

Nemanič

McGuiness

Daneu

et al. 2012

Journal of Alloys and Compounds

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Section: Discussionmentioning

confidence: 99%

“…The SiN film deposition is assumed to reduce considerably K a,i and consequently W i at the inlet side (denoted by an index i). This leads to the ''inlet-surface-limited regime'' and for this regime the permeation flux j can be approximated by [25].…”

Section: Discussionmentioning

confidence: 99%

Hydrogen permeation through silicon nitride films

Nemanič

McGuiness

Daneu

et al. 2012

Journal of Alloys and Compounds

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“…In accordance with the surface-limited regime (SLR) mechanism, the adsorption and recombination processes are decisive for the kinetics; 26 moreover, this mechanism can be further divided into an outlet surface-limited regime (OLR) and inlet surface-limited regime (ILR) when the surface conditions on the two sides of the membrane are different (asymmetric membrane). 28 Usually the diffusion-limited regime is applied in materials softer in the inlet side and more rigid on the outlet side, while the surface-limited regime is applied in those softer on the outlet side and more rigid on the inlet side. 29 So, in the DLR mechanism, the goal is to produce a hydrogen trap through many vacancies in the material to capture the hydrogen atoms during permeation; carbides and nitrides are this type of coating materials.…”

Section: Calculation Of Hydrogen Permeabilitymentioning

confidence: 99%

“…In accordance with the surface-limited regime (SLR) mechanism, the adsorption and recombination processes are decisive for the kinetics; moreover, this mechanism can be further divided into an outlet surface-limited regime (OLR) and inlet surface-limited regime (ILR) when the surface conditions on the two sides of the membrane are different (asymmetric membrane) …”

Section: Hydrogen Barring Principles and Barrier Classificationmentioning

confidence: 99%

Mechanism and Evaluation of Hydrogen Permeation Barriers: A Critical Review

Li,

Barzagli,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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“…[18] and to derive surface limits, e.g. [19]. In the model by Waelbroeck the release from the surface is described by Γ WB Rec ∝ K r CS0 2 and the governing parameter K r is called 'recombination coefficient' despite the fact that it does not really describe recombination in the sense of the actual Langmuir-Hinshelwood process occurring from the chemisorbed surface states.…”

Section: Introductionmentioning

confidence: 99%

On the use of recombination rate coefficients in hydrogen transport calculations

Schmid

Zibrov

2021

Nucl. Fusion

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The commonly accepted picture for the uptake of hydrogen isotopes (HIs) from the gas phase across the surface into a metal with an endothermic heat of solution for HIs is that of dissociation followed by thermalisation in a chemisorbed surface state and finally overcoming a surface barrier to enter the metal bulk where the HIs occupy interstitial solute sites. To leave the metal bulk the HIs first transition to the chemisorbed surface state from which they then enter gas phase by recombining into a diatomic molecule. This model is generally attributed to the work of Pick and Sonnenberg from 1985. They clearly distinguish surface states and subsurface solute sites where the recombination flux is proportional to the square of the concentration of chemisorbed atoms due the diatomic nature of this Langmuir–Hinshelwood process. In an effort to compare their extended model with an earlier surface model by Waelbroeck, which uses an expression for the recombination flux proportional to the square of the sub-surface interstitial solute concentration, they derive an effective recombination coefficient. However, also with the so-derived Pick and Sonnenberg recombination coefficient, the Waelbroeck model is only applicable under certain conditions. But, due to its simplicity, it is often used in boundary conditions of diffusion trapping type calculations, generally ignoring whether or not these conditions are met. This paper will use the full Pick and Sonnenberg model implemented in the TESSIM-X code and in simplified algebraic approximations, to show the limits of applicability of the Waelbroeck–Ansatz in modelling hydrogen transport in metals foreseen for the first wall of magnetic confinement fusion devices.

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Hydrogen gas-driven permeation through the membrane with asymmetric surface conditions

Cited by 12 publications

References 16 publications

Hydrogen permeation through silicon nitride films

Hydrogen permeation through silicon nitride films

Mechanism and Evaluation of Hydrogen Permeation Barriers: A Critical Review

On the use of recombination rate coefficients in hydrogen transport calculations

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