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Comparison of the Taylor-Aris theory (solid line) with the experimental data of Vodeneev et al. (2012) (broken line; data points are circles). The physical parameters used for the theory are a = 60 μm, u¯ = 0.12 cm s-1, D = 0.25 × 10-5 cm2 s-1,and σ/C = 0.0001 cm-1. In this case the effective diffusivity according to (12) is D e = 0.0043 cm2 s-1.
