Figure 6
From: Pore geometry control of apparent wetting in porous media
Phase diagram in θ–rp space for the micromodel geometry with ϕ = 0.42, A = 94 mm2 and N = 222, separating the region where apparent wettability is affected by pore geometry (−1 ≤ W ≤ 1) from the regions where pore geometry influence on apparent wettability is negligible, leading to strict imbibition (W < −1) or strict drainage (W > 1) conditions. The boundaries (black solid lines) of the phase diagram correspond to the values of W = −1 and W = 1, where pore geometry and surface properties have equal impact on apparent wettability. The insets illustrate the shape of the fluid-fluid interface in converging (solid purple) and diverging (dotted green) sections of a typical pore throat. The flow direction for the insets in from left to right. The symbols (red stars) indicate the range of θ values where co-existence of concave and convex interfaces is observed in the numerical simulations (Figs 3 and 4).
