Porous Matrix
This node defines the porosity, defined as the volume fraction occupied by a fluid phase, when modeling transport in a Porous Medium or a Porous Catalyst.
The default Porosity εp of the solid matrix is taken From material. The Porous Matrix node supports the use of a Porous Material node, where the porosity is defined in the manner of
where θs,i and θimf,i are the volume fractions given in Solid and Immobile Fluids subnodes under the Porous Material node.
For User defined, enter a value or expression for the porosity.
Density
In a Porous Catalyst, the dry bulk density ρ of the porous medium is needed. This is used to compute mass phase transfer due to adsorption or desorption.
Select Dry bulk density when this quantity is known. Or select Solid phase density to instead compute the dry bulk density from the solid phase one. In both cases the density definition can be taken From material or User defined.