Mechanism 1 (Taylor dispersion):
Caused by different flow velocities within a single pore, due to viscous effects between the fluid and the stationary porous matrix
slow flow in narrow pore
fast flow in wide pore
Mechanism 2:
variations in
flow velocity
between pores
Three mechanisms for mechanical dispersion
during flow through porous media
Mechanism 3:
variations in path lengths (or travel times) along different flow paths