FEBEX type Vapour diffusion.

The model was presented in [32].

The vapour diffusion can be described by [27], [28], [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 [32]

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

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.

Child parameters, attributes and cases

Additional info

Used in the following test data files