This feature is available when the Mass transfer in porous media check box is selected in the
Settings window for the physics interface.
where hc is the mass transfer coefficient,
kG,c the volatilization coefficient, and
cGatm,c the concentration in the surrounding atmosphere.
Enter a Mass transfer coefficient hc defining the transfer into the surrounding media. This can be given by boundary layer theory. When assuming that no convective flow is present in the surrounding, the mass transfer coefficient can be defined from the gas diffusion coefficient
DGc and the thickness of the diffusion layer
ds in the manner of
Also give the atmospheric concentration for each species, cGatm,c. The
Volatilization coefficient
kG,c for each species are taken from the adjacent
Unsaturated Porous Medium domain.