Adsorption
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.
Use this node to model adsorption of the fluid phase species onto the porous media surface. It is available as a subnode to the Porous Media Transport Properties and the Partially Saturated Porous Media nodes.
Select a Sorption type — Langmuir (the default), Freundlich, or User defined to specify how to compute cP, the amount of species sorbed to the solid phase (moles per unit dry weight of the solid):
•
For Langmuir:
Enter a Langmuir constant kL,c (SI unit: m3/mol) and an Adsorption maximum cp,max,c (SI unit: mol/kg):
•
For Freundlich:
Enter a Freundlich constant kF,c (SI unit: mol/kg), a Freundlich exponent NF,c (dimensionless), and a Reference concentration cref,c (SI unit: mol/m3).
•
For User defined:
Enter an Adsorption isotherm kP,c (SI unit: m3/kg).
For more information, see Adsorption in the theory section.
Further Reading
See the theory chapter in the section Mass Balance Equation for Transport of Diluted Species in Porous Media.