[Amir.11]

Hi all,
I am working on population balance model to see how particle distribution changes through a continuous reactor.
At this stage the only phenomena occurring in the reactor is particle growth rate which in fact has absolutely no effect on the number of particles. So the same number of particles has to be obtained at inlet and outlet. However, it is not the case with fluent.
First I saw this problem was when I tried to increase the residence time and realized that the number of particles at outlet decreases with increasing residence time.

So I thought it is because of my class definition and the number of classes is not enough to cover all possible particle in the reactor. I increased thus the number of classes testing 30, 35 and 40 classes and obtained always around 16% lost in particles.

Attached you can find the results on number of particles vs. number of classes at steady state (growth rate value, particle volume fraction and inlet velocity are all the same in these cases):

I am using fluent 19.2 Population balance discrete method with mixture multiphase method.



Could you please help me out with this issue?
Any suggestions and comment is greatly appreciated.
Amir