This feature is only available in a limited set of add-on products. See http://www.comsol.com/products/specifications/ for more details on availability.

This feature is available when the Volatilization in partially saturated porous media check box is selected on the Settings window for the physics interface.

Use the boundary condition to model a thin layer through which mass is transported by volatilization only. To set up the node, specify the layer thickness and the atmospheric concentration of each species in the thin layer for each transported species.

Enter a Layer thickness ds and the atmospheric concentration for each species. The Gas diffusion coefficient DG,c (SI unit: m2/s) and the Volatilization coefficient kG,c (dimensionless) for each species are taken from the adjacent Partially Saturated Porous Media domain.