FLUENT-DEM/drag law
 

Hi
I'm Modelling particles composed of oil, fat and grease in water flowing through a circular pipe. the particles are either floating or partially dispersed within the flow due to the turbulence.
how can I decide the suitable drag law for the particles?
also if I want to assume that the particles enter the pipe with the flow how can I define the injection or do I need to set any injection in this case?