Heat Transfer Between the Bulk Fluid and External Surfaces of Solid Catalysts

Substitution of the Schmidt numbers and composition values calculated previously, and an appropriate average value for y, permits one to determine the difference in mole fractions. In the present instance, we may use y, g values without significant error. Hence, 

We would be remiss if we did not indicate that a significant temperature difference also exists between the bulk fluid and the external surface. This AT has a far greater effect on the observed rate than does the difference in SO2 concentrations. Illustration 12.6 indicates how the temperature difference may be calculated. 

In view of the fact that our results are reasonably sensitive to the estimate of the bed porosity used in the analysis, these results are not bad. If one had employed a value of 

3 or 0.5 rather than 0.4 for eg, jp would change significantly and this change would have a major influence on the calculated values of the concentration (or mole fraction) differences. Unfortunately, bed porosity data were not noted in the article cited. In an experimental program being conducted as an aspect of a reactor design, this parameter could easily be determined. 

5 HEAT TRANSFER BETWEEN THE BULK FLUID AND EXTERNAL SURFACES OF SOLID CATALYSTS 

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Heat Transfer between the Bulk Fluid and External Surfaces of Solid Catalysts... 

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