Diffusion Process and Reaction on a Surface

Figure 8

(a) illustrates the mean square displacement for species for different values of by taking into account the Riemann-Liouville fractional time operator. We consider, for simplicity, , and , , , and , in arbitrary unities. (b) illustrates the mean square displacement for species for different values of for species by taking into account the Caputo-Fabrizio fractional time operator. We consider, for simplicity, , and , , , and , in arbitrary unities.

(a)

(b)