Average solute concentration normalized by the external bath concentration, , as a function of time, for various choices of governing parameters (Rg = 1, Rd = 1, ε0 = −0.20 and f̂ = 1000; Rg = 1, Rd = 1, ε0 = 0; Rg = 1, Rd = 1, ε0 = −0.20 and f̂ = 10).