Ammonia Absorption in water

[naveedullah]

Hello.

I am using volumetric reactions in my case (ammonia absorption in water) in ANSYS FLUENT. I configured the reaction but am now encountering a warning "

Warning: mass imbalance in reaction-1 stoichiometry. The fluent setup disappears when I run the simulation (shuts down). Can someone please assist me in resolving this problem?

Please look at the attached picture for further clarification.

[Rob]

Where is the missing mass in the products? Ie where did the H+ go?

[naveedullah]

Thank you, Rob

Actually, I am inputting ammonia at the inlet using Eulerian and then injecting water using DPM injection. These two are the reactants. The products are NH4+ and OH- ions. Here in the snapshot, product 1 (nh3l>) properties are modified for the ammonium ion, so no H+ is there. Still, the error, as mentioned above, is there.

Also, could you suggest using the volumetric reaction in species transport (the one I am using) or defining the UDF for water ammonia absorption?

Thank you

[Rob]

Eulerian multiphase and DPM or single phase and DPM? 

[naveedullah]

Eulerian multiphase and DPM.