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Model ID: 5

Transport and Adsorption

This model shows a simple example of the modeling of surface reactions coupled to transport of species to the reacting surface. In most cases, the reaction rate expression can be defined as a function of the concentration of the reacting species and products. However, in adsorption reactions, the surface concentrations of the active sites or surface complex have to be modeled.

This implies that the mass balance in the bulk of the reactor has to be coupled to the mass balance for species present only at the surface of the catalysts, biochip, semiconductor component or any other process with surface specific species.

The model in this example treats a small parallel plate reactor with an active surface. These types of processes are found in heterogeneous reactors, biacore devices, etc.

The problem shows one of the most unique COMSOL Multiphysics features, namely the coupling of phenomena defined in different dimensions. In this case, a surface process is coupled to a process defined on a volume.

The modeled domain is a parallel plate reactor with an active surface where the concentration of surface species has to be modeled.

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