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Quiz6key_Sp10

# Quiz6key_Sp10 - CEE 320 Environmental Engineering Quiz#6 F...

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CEE 320 Quiz #6 Environmental Engineering F 5 March 2010 CONTINUED ON REVERSE PLEASE WRITE YOUR NAME ON THE BACK Quiz #6 solution key (note: read the problem statement carefully - it is not identical to the one on your problem set) Useful information: For an equation of the form: dC dt = S LC , the solution is: C ( t ) = C o exp( Lt ) + S L [1 exp( Lt )] Question: A fluid flows through a reactor with mean residence time given by Θ . The system is illustrated below. The concentration of a contaminant species C in the fluid at the reactor inlet is 0 for all times t < t 1 . For all times t > t 1 , the concentration at the inlet is maintained at C in = C 1 . At t = 0, the tracer concentration within the reactor is zero. Within the reactor, the species undergoes first-order decay with rate constant k: C products R = kC For cases (a) and (b), sketch the time-dependent contaminant concentration at the outlet, C out (t), for t 0. The concentration and time scales should be properly and completely labeled with the same level of detail that we used in lecture.

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Quiz6key_Sp10 - CEE 320 Environmental Engineering Quiz#6 F...

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