The whole vessel has a height of 10m and a diameter of 2.3m. The pipe has a diameter of 0.4m. The most critical parts is the air coming out of the pipe and colliding to the conical diffusor plates. My goal is to see how big does the pellets influence the velocity of the air close to the diffusor and lower vessel (4m height). I have done a lot of simulations without the pellets before just to see how the air behaves inside the vessel. My next step is to compare the 1phase and 2phase system without inflation layers.