Use this node to model the composition in a gas or liquid mixture as it is transported though the interstices of solid porous medium. In addition to transport due to convection and diffusion, the node contains functionality to include species evolution through reactions in the fluid phase.

Species transport in a porous medium is affected both by properties of the fluid phase as well as properties of the solid matrix. These properties are defined in the Fluid node and the Porous Matrix node respectively. The Porous Medium node supports material properties using a Porous Material node (described in the COMSOL Multiphysics Reference Manual), where properties are defined per phase in a similar manner.