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Particle transport in a surfactant-laden plug for (a) losing and (b) gaining mass for h2=0.05, C0=5×10−4. Each particle has a tag which indicates its initial location: film front (FF), film rear (FR), wall front (WF), wall rear (WR), core front (CF), and core rear (CR). Initially, a liquid plug of LP=1 begins to propagate driven by a constant pressure drop (a) ΔP=1 and (b) ∆P=0.5. From Fujioka et al. (2008).
