Laws for calculating effective diffusion coefficients. More...
When averaging over a given volume of a porous medium, diffusion appears effectively restricted since not all volume is accessible to particles and diffusion is hindered by the solid matrix acting as obstacles. Effective diffusivity laws provide constitutive relations for the effective diffusion coefficients based on the solid matrix material parameters and the fluid configuration in the pore space.
The effective diffusion coefficient of component
where
Bear [14] reports values of
The following laws are implemented:
For DiffusivityConstantTortuosity
, "SpatialParams.Tortuosity"
. This will change the value of effectiveDiffusionCoefficient
is used.
For DiffusivityMillingtonQuirk
, the tortuosity coefficient is estimated after Millington and Quirk (1961) [58] by
See also Helmig (1997) [41] [page 129].
Files | |
file | diffusivityconstanttortuosity.hh |
Relation for the effective diffusion coefficient with constant tortuosity. | |
file | diffusivitymillingtonquirk.hh |
Relation for the effective diffusion coefficient after Millington and Quirk. | |
Classes | |
class | Dumux::DiffusivityConstantTortuosity< Scalar > |
Relation for the effective diffusion coefficient with constant tortuosity. More... | |
class | Dumux::DiffusivityMillingtonQuirk< Scalar > |
Relation for the effective diffusion coefficient after Millington and Quirk. More... | |