Interfacial Heat and Mass Transfer Closures

In this section the classical heat and mass transfer theories are examined. The singular surface jump conditions for the primitive quantities, as derived in the framework of the standard averaging procedures, are approximated by the classical chemical engineering stagnant film theory normally used in chemical reactor models. The relevant transport phenomena solutions and the classical theories on heat and mass transfer considering both low- and high mass transfer rates are summarized in the subsequent subsections. 

Using the mean value theorem the interfacial mass transfer rate due to phase change (3.149) becomes [12, 54, 63]  

Similarly, the interfacial heat transfer (3.180), as related to (3.206), and the species transfer (3.184) due to phase change are normally expressed in terms of interfacial mass flux weighted quantities 

It is noted that in the general case the interface velocity is not equal to the neighboring 

In the field of chemical reaction engineering, on the other hand, the elementary modeling principles still being used in the modern fluid dynamic reactor models did not evolve from any averaging concept, since the classical reaction engineering 

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Interfacial Heat and Mass Transfer Closures 601 The diffusive flux is then found by differentiating the concentration profile ... 

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