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Figure 5
Results of the 3D numerical convection–diffusion-reaction model. The reaction involved ascorbic acid H2Asc and ferricyanide [{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{3-}] reactants and de­hydro­ascorbic acid Asc and ferrocyanide [{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{4-}] products. (a) Concentration fields of [{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{3-}] (top row) and [{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{4-}] (bottom row) in isometric view. (b) [{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{3-}] (top row) and [{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{4-}] (bottom row) concentration fields in three yz planes. Each column of (b) shows an axial position x with corresponding t and depth-averaged, unreacted sample fraction MR. Data in both panels are for Qsa = 30 µl min−1, Qsh = 1 ml min−1, [{\left[{{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{3-}}\right]_0}] = 40 mM, and [H2Asc]0 = 200 mM, and pH = 10.

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