FEBEX type Vapour diffusion.

The model was presented in [35].

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 [35]

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

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