Bulk Fluid to Catalyst Pellet

Heat transfer to the pellet is calculated by appl5dng Equation 28 of Chapter 14 in Reference 31  

This relationship assumes that all the reactions occur inside the pellets, and that none occurs in the bulk fluid. This is a very good assumption in a steam reformer. The heat of reaction is backed out of the heat effects, since heats of reaction are not explicitly used elsewhere. Heats of formation are based on elements at their standard reference states, so the overall heat effects (sensible plus reaction) are included in enthalpies. 

The bulk fluid to catalyst pellet heat transfer coefficient, hg, is calculated as a function of fluid properties, catalyst size, and fluid temperature using the heat transfer relationship from Reference 11, page 89, Table 4.2  

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