Distribution and Electrical Similarity

Electrochemical reactors, unlike their catalytic counterparts, require electrical similarity. This is often the most important consideration in the scale-up of electrochemical reactors. Considerable attention will be devoted to this 

Electrical similarity exists between two units when corresponding potential and current density differences bear a constant ratio. The two sizes of cells will require the same cell voltage and current distribution. The criterion often necessitates a constant interelectrode gap on scale-up. A variety of dimensionless groups have been proposed as similarity criteria. One for example is the so-called polarization parameter P, defined as  

Dimensionless groups to be used have also been determined from models of current distribution. 

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