Thank You So much for your answer. could you please expand on what you mean by the settings and the rise/sink? I will upload mine.


 I want to emphasize that the gasoline is first a continuous phase and then turns into dispersed after passing through the mixer.

keeping that in mind, isn't the population balance method for a condition that we have droplets at the inlet and we define them from the inlet (Which we don't have in this case)? am I wrong?