Currently with our flow design we have designated the inner tubing domain as a user-defined material. This was because you cannot add more than one material to a domain, but we wish to have all individual reactant material properties (viscosity, density, heat capacity of each component) present in the equations due to the reaction taking place and thus changing the bulk fluid characteristics (very viscous product). So we currently have written some equations for this user-defined material that averages out the fluid viscosity, density, heat capacity, etc. in terms of the mass fractions of each component which are dependent on the developing reaction (as well as time as this is time dependent), however, this has given us some problems in that we are not getting the concentrations that we are expecting. Is there a particular module/physics application that can take care of this for us and bypass the need for user-defined equations while still showing the aforementioned material properties as changing with composition?
Physics currently using; heat transfer in fluids, laminar flow, and transport of conc. species. We have reaction engineering and CFD modules available.
In summary, what is the best way that you all have seen to accurately and realistically depict a reaction taking place in flow.
Thank you!