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Bubble pressure versus adsorption depth parameter. The other parameter values are: Ca = 0.4, η = 100, ϕ = 0.5, Peb = 50, Pes = 103, Sta = 0.3, Std = 0.03 and El = 1. The dashed line, with λ → ∞, represents the surfactant-free case, while the dotted line represents the bulk equilibrium limit.
