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Concentration profiles φ̄(x, t) at a fixed instant of time (v0t/w0 = 200) for several values of the electro-osmotic flow strength, u* = ueo/v0. The increased effective axial diffusivity due to Taylor dispersion “softens” the electromigration shock that tends to form at the leading edge. Here P = 50 and x = xc is the location of the centroid of the peak.
