Particle Tracking and Patch Region

Sri

hi,

i am using Eulerian Multhiphase model with the primary phase as air & silica as the secondary phase. it is a fine grinding process in a jet milling device. i need to show the profiles of these phases within the mill & the movement of solid particles from the inlet to outlet. How to do the particle tracking for this solid silica ? what are the things to be considered for 'patch region' selection? Please kindly help me. thank you.

sri