Porous Matrix
This node sets the porosity when modeling transport of diluted species in a Porous Medium or an Unsaturated Porous Medium. The porosity corresponds to the volume fraction occupied by the species containing fluid.
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By default the porosity of the solid matrix, εp, is taken From material. The Porous Matrix node supports the use of a Porous Material added to the Materials branch. In this case 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.
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Select From pellet bed densities to compute the porosity using the (dry bulk) Bed density ρb and the (single phase) Pellet density ρpe. The porosity is then defined from
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For User defined, enter a value or expression for the porosity.