[case] VapourDiffusionFEBEX

FEBEX type Vapour diffusion.

The model was presented in [33].

The vapour diffusion can be described by [28], [29], [9]

\[ D_v=D_0 \left(\frac{T}{273.15}\right)^{n} D_{vr}, \]

where \(D_{0}\) is the base diffusion coefficient with default value \(2.16\cdot 10^{-5}\) \({\text m}^2 \text{Pa}/(\text{s}\text{K}^{n})\), \(n\) is the exponent with default value 1.8, \(D_{vr}\) is the the relative diffusion coefficient, and \(T\) is the temperature.

In the FEBEX type, \(D_{vr}\) takes the form of [33]

\[ D_{vr}=\tau \phi (1-S_L), \]

with \(\phi\), the porosity, \(S_L\), the liquid saturation, and \(\tau\), the tortuosity.

Note: In order to maintain consistency with the implementation of the computations of other vapor-related parameters, \( \phi (1 - S_L )\) is removed from the implementation for this class and is multiplied back in the local assembler.

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Used in the following test data files

Used in no end-to-end test cases.