Reactors with two process streams in cross flow

Reactors with two process streams in cross flow 

If there were true cross flowy where two process streams move each in two perpendicular directions, and each in plug flow, there would be two-diomensional concentration profiles for both reactants. The calculations would become very complicated. However this situation is difficult to visualize. A more realistic physical example that is usually indicated with the term cross flowy is the following  

Consider a number of mixed reactors in series, with a liquid containing reactant B flowing through it. A gas, containing reactant A is introduced in each reactor. 

This has to be integrated over the height of each reactor. Now we have the same situation as describe in section 7.3.3, see eqs. (7.36) - (7.38). The calculation can be made for the flrst reactor in the cascade, then the second, etc. Note that the gas coming from each reactor has a different A-content. 

In reactors with mainly axial flow, axial mixing can often be described with good accuracy, and the effects are usually limited. 

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