[Laexzzz]

Hey, i am modeling 3d reactor with chem. reaction, but I ran into some difficulties.

Concentration is changing very rapidly near the inlet, and then becomes constant.





Then I made a 2d version (very fine mesh).
270000 quadrilateral cells, zone 2, binary.
90 2D mass-flow-inlet faces, zone 3, binary.
90 2D outflow faces, zone 4, binary.
2220 2D wall faces, zone 5, binary.
538800 2D interior faces, zone 7, binary.
271201 nodes, binary.
271201 node flags, binary.

Result



(click to zoom in)



So, there is a small layer near inlet, where concentration is changing.
I tryed different boundary and different reaction - result is the same.
WhenI modeled the reaction in a tube, results were better