The Reacting Flow in Packed Beds, Transport of Diluted Species interface () is used to model a reactor filled with porous catalytic pellets. In addition to interparticle mass transport, intraparticle transport of chemical species and reactions can be studied in detail.

It combines the Brinkman Equations interface (), and a Transport of Diluted Species in Packed Beds interface (). The Reacting Flow, Diluted Species multiphysics coupling, which is added automatically, couples fluid flow and mass transport. A Porous Material node, including a Fluid and a Solid subnode, is also added to the component.

The Brinkman Equations interface computes the fluid velocity and pressure fields of single-phase flow in porous media in the laminar flow regime. A Porous Medium feature is active by default on the entire interface selection.

The Transport of Diluted Species in Packed Beds interface solves for the concentration of an arbitrary number of bulk species, and optionally, an arbitrary number of surface species in porous pellets. The bulk species are assumed to be solutes, dissolved in a solvent of significantly higher concentration. In the current multiphysics interface a Packed Bed feature is active by default on the entire interface selection.