Question
Can Flownex model absorption and desorption processes between a fluid and a surface? For example, can species be absorbed from a fluid into a solid surface and later released back into the flow, and are there any example models demonstrating this capability?
Answer
Yes, absorption and desorption can be modeled in Flownex, although this is not currently provided as a dedicated native feature. A common approach is to use scripts together with boundary conditions to modify the fluid composition during the simulation. By manipulating quantities such as mass fractions, users can represent the transfer of species between a fluid and a surface and model both absorption and desorption behavior.
This approach has been successfully demonstrated in example applications, including a carbon capture demonstration model. The example uses scripting and boundary condition modifications to represent the absorption and release of species within the system. For more advanced or application-specific requirements, customized scripting can be developed to match the desired absorption and desorption mechanisms.