Fig. 1. Evolution of pore-size distribution over time according to Eq. [13] with no decay, a time-dependent drift term V(t) given by Eq. [14] with a = 0.01 d^-1, b = 5 µm, <r₀> = 7.5 µm (shown in insert), and a constant dispersivity: (a) = 1 µm and (b) = 0.1 µm. The initial distribution is according to Eq. [5] with _s = 0.469, _r = 0.191, = 0.253, and r₀ = 7.3 µm.

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