Trapping and hysteresis in two‐phase flow in porous media: A pore‐network study

摘要: [1] Several models for two-phase flow in porous media identify trapping and connectivity of fluids as an important contribution to macroscale hysteresis. This is especially true hysteresis relative permeabilities. The propose trajectories from the initial saturation end various ways are often based on experiments or pore-network model results endpoints. However, experimental data pore-scale not available trajectories, that is, fate while changes. Here, using a quasi static model, supported by set laboratory experiments, we study how topology changes during drainage imbibition including first, main scanning curves. We find strong hysteretic behavior relationship between disconnected nonwetting fluid wetting water-wet medium. coalescence invading phase with existing depends critically presence (or lack thereof) connected at beginning process well pore geometry. dependence involves mechanism refer ‘‘reversible corner filling.’’ can also be seen volcanic tuff. impact these macroscopic discussed.