I want to detect the gas residence time in spouted bed.
Can MFIX do that if I change the gas density suddenly and then resume the gas density?
Or I just used some very small particle and light particles?
Assuming the spout gas has a colour for one second and then become normal. I want to see how long the colourful gas flow out from the reactor
we can run 5s, then stop it. change the gas species. Then run another 0.02 s, stop it again and change the gas species back.