adif¶
Air-water vapor diffusion. The air-water diffusion equation is given as Equation (21) of the “Models and Methods Summary” of the FEHM Application (Zyvoloski et al. 1999).
- Group 1 - TORT
| Input Variable | Format | Description |
|---|---|---|
| TORT | real | Tortuosity for air-water vapor diffusion.
If TORT > 0, \(\tau\) of eqn 21, otherwise
if TORT < 0, \(abs(\tau \phi S_v)\) of the same equation.
If TORT > 1, water-vapor diffusion coefficient is set equal to the value
specified for the first vapor species defined in the trac macro.
|
The following is an example of adif. In this example the tortuosity (\(\tau\))
for vapor diffusion is specified to be 0.8.
| adif |
| 0.8 |
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