OGS
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The Penman-Millington-Quirk (PMQ) Vapour diffusion model.
The model was presented in [7]
The vapour diffusion can be described by [20], [21], [7]
\[ D_v=2.16\cdot 10^{-5} \left(\frac{T}{273.15}\right)^{1.8} D_{vr}, \]
where \(D_{vr}\) is the the relative diffusion coefficient, and \(T\) is the temperature.
In the PMQ type, \(D_{vr}\) takes the form of [7]
\[ D_{vr}=0.66 \phi (1 - S_L )^2, \]
with \(\phi\), the porosity, \(S_L\), the water saturation, \(0.66\) the tortuosity constant.
Used in no end-to-end test cases.