Transport of diluted species (Problem with catalyst pellet radius)
Hi, I am modeling a catalyst pellet for fischer tropsch synthesis (43 species in the reaction). I have the model set up but it is converging only for small particle diameters (0.01mm) when ever I...
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Without seeing the model I can ask only: 1. Is it a steady-state or a time dependent problem? 2. Is there a diffusion boundary layer around the particle? br Lasse
View ArticleRe: Transport of diluted species (Problem with catalyst pellet radius)
Hello Dr. Lasse, My model is a stationary one. The is no diffusion boundary layer around the particle. In the model CO gets completely consumed towards the center of the particle and eventually becomes...
View ArticleRe: Transport of diluted species (Problem with catalyst pellet radius)
I looked at your model. It is terribly complicated, so it is difficult to see where the problem resides. Reaction-diffusion systems do not always have a steady solution, but may oscillate when the...
View ArticleRe: Transport of diluted species (Problem with catalyst pellet radius)
Thank you for your reply. But is there a way to limit the concentration to positive values?? I tried if(CO<0,esp,CO) as an initial condition for concentration of CO but still comsol gave me negative...
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