DISPERSION IN 2-DIMENSIONAL PERIODIC POROUS-MEDIA .2. DISPERSION TENSOR

The dispersion tensor of two-dimensional periodic porous media is inve stigated numerically. The theory is first briefly reviewed using the v olume averaging method. Then, with the help of the hydrodynamics deter mined in Part I of this study, the dispersion tensor is calculated bot h for ordered (in-line or staggered square cylinders) and disordered ( randomly distributed square cylinders) varying both the particle Pecle t number (0<Pe(p)<10(4)), the particle Reynolds number, from the Stoke s flow to the laminar-inertial regime (0<Re-p<100), and the direction of the average how with. the axes of the unit cell. The influence of o rder and spatial periodicity is discussed. Lastly the results ate comp ared with those for ''real'' porous media. (C) 1997 American Institute of Physics.