[W—Q K]

Hi everyone, can you ask a question? That is, when my fluid contacts the wall, there will be a catalytic reaction, but the fluid that does not contact the wall will also have a similar reaction (hydrolysis) by itself, and the reaction rate is different. In this case, how should I distinguish between these two simultaneous reactions? What can be achieved (udf-my idea)? That is, I can get the reaction function of the non-touching wall fluid with the temperature, but how to distinguish the contacting wall surface and the non-contacting wall surface fluid, how does udf realize? Can you give some suggestions? I will be very thankful!