Dear developers,
I simulate a reactor case where the particles flow downward from the top and the heated gas flows upward from the bottom. The particles flow against the gas. In the early part of the run, the particles flowed freely, but why in the late part of the run, there was a buildup of particles. How to explain this phenomenon from a mechanistic point of view?
Thanks a lot
I would be interested in trying to set this up in MFIX-Exa if you would share with me the details of your case.
Sure. Sorry for the long delay in uploading the case. The particles enter the flow channel from the top and move downward while the reaction begins. Reaction chemical equation: AAA(s)=BBB(s)+CCC(g)
Thank you very much!
case.zip (2.8 MB)
Sorry I guess I wasn’t entirely clear, do you have a list of particle properties, dimensional drawings of the geometry, etc? Picky I guess, but I don’t feel like sifting through an MFiX setup. If not, NBD, sorry for distracting from your original question.
My guess is the upflow gas is slowing down the particles, they start accumulating, and it decreases the cross section area. This in turns increases velocity/lower pressure and it slows down particles even more. This effect may be amplified if a large amount of gas is releases through the chemical reaction.
OK, I think your analysis makes sense. Thanks!
Please wait a bit, I’ll upload it when I’ve summarized it.