for calculating the residence time distribution (RTD) if I use the pulse tracer method for evaluating the flow behavior in the packed bed reactor. what is the best method for calculating the response tracer concentration in the outlet of the reactor?
It is better to measure the tracer concentration at the reactor outlet than to calculate it. Then, having the function E (t) (in discrete form), approximate it using one of the known probability distribution functions, or/and set an average residence time. You can also describe the process in the reactor, taking into account for example the axial dispersion (nonideal flow model) - but that is a more difficult task. You can find them all for example at the
http://www.umich.edu/~essen/html/byconcept/chapter13.pdf
and in many other books on the chemical reactors engineering.
Hi. I agree. It is better to measure the tracer concentration at the reactor outlet than to calculate it. Then with this experimental information, you could find the dispersion kind in the reactor. The mathematical procedure is explained in chapter 13 "Distribution of residence times for chemical reactors" of the book "Elements of Chemical Reaction Engineering" (Fogler).
The above web address concerns the thirteenth chapter of Fogler's book.
Regards,
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