help in choosing a model

Hi,
I an trying to model a liquid solution,that contains particles,that enters as a drop(hemisphere) to a pipe full with air.
Between the air and the solution there is a surface tension.
I am trying to model this problem with the "mixture model,laminar flow" (for the solution with particles) combined with the model "laminar two phase flow,level set" (for the flow of the air and the solution).
Does the choose of this models is correct? if not, how can i model this problem?

thanks,
anna