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The effect of the adsorption depth parameter λ on (a) the surface velocity us, (b) the surface concentration Γ and (c) the subsurface concentration Cs. The inset in (a) shows that the surface velocity changes sign near the bubble tip for sufficiently small λ. 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.
