Inlet temperature

Question: Based on looking at earlier models, do you expect the final ammonia concentrations to be higher, lower, or no effect when the inlet temperature is increased?
 

Higher and No Effect
 

Lower
 

Varying the inlet temperature affects the rate of ammonia consumption through the rate equation. By increasing the inlet temperature from 673 to 873, the extent of reaction increased, resulting in higher exit concentrations of ammonia, as seen in the figures below.

In comparing the contour plots of T=673 (4.11) and T=873 (4.12), note that while the figures look similar, the legend for the colors indicates that the T=673 run has a minimum concentration almost ten times higher than the T=873 run.

Graph 4.11 (673K)

Graph 4.12 (873K)

Comparing line plots of the channel outlet ammonia concentrations also clearly demonstrates that increasing temperature increases consumption of ammonia, thus decreasing the final ammonia concentrations. As before, T=673 (4.13) and T=873 (4.14).

Graph 4.13

Graph 4.14

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