Correct!

The faster flow rate means that the fluid spends less time in the reactor. Reduced time in the reactor means that the fluid spends less time near the platinum catalyst, which means that there is less time for the reactor to occur. This decreased extent of reaction can be seen in the three contour plots below, which correspond to flow rates of 1, 10, and 50 (from left to right). In all cases there is nominal heat generation of 0.1227 at the walls. At the highest flow rate, almost no ammonia is consumed at all (recall that the initial ammonia concentration is 0.4).

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