Limiting current gradual approach

We consider the case in which substance Ox in the solution is completely reduced to Red at the electrode. During the electrolysis, the concentration of Ox gradually decreases and approaches zero. This process is illustrated in Fig. 5.31 by the cur-rent-potential curves the decrease in the limiting current corresponds to the decrease in the concentration of Ox [19]. 

Until 10 to 15 years ago the combined approach of macromixing and micromixing models was very widely used in the field of CRE but gradually CFD-based strategies have replaced the first mentioned strategy. In this respect it should be noted that this change also introduced big conceptual differences because the traditional CRE approach is usually formulated in the age space of fluid parcels whereas in CFD approaches a Eulerian framework is often adopted. Subsequently a brief overview of CFD-based approaches for reacting flows is presented and the current limitations are also indicated. 

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