Magnetic resonance imaging is used to investigate, at the pore scale,
the dissolution and mobilisation of discrete non-aqueous phase liquid
(octanol) ganglia trapped within porous media by capillary forces, by
a mobile aqueous phase. Dissolution Bs observed to be described by a m
ass-transfer limited model, Mobilisation of entrapped ganglia commence
s at lower flowrates when a surfactant is introduced into the mobile a
queous phase. (C) 1998 Elsevier Science Inc.