OGS

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]
\[ D_{vr}=\tau \phi (1S_L), \]
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 vaporrelated parameters, \( \phi (1  S_L )\) is removed from the implementation for this class and is multiplied back in the local assembler.
No additional info.
Used in no endtoend test cases.