## Dispersion properties for residence time distributions in ...

Assuming the axial dispersion of particulate material, the residence time distribution Φ ( t) at the mill exit ( x = L) is expressed by [2], Φ ( t) = L 4 π E t 3 exp − ( L − u t) 2 4 E t where E is the axial dispersion coefficient of particles corresponding to the diffusion coefficient in molecular diffusion and u is the axial mean velocity of …