The subscript to each of the problem numbers indicates the level of difficulty: A, least d...

The subscript to each of the problem numbers indicates the level of difficulty: A, least difficult; D, most difficult.

Make up and solve an original problem. The guidelines are given in Problem P4-1A. However, make up a problem in reverse by first choosing a model system such as a CSTR in parallel with a CSTR and PFR [with the PFR modeled as four small CSTRs in series; Figure PI4-1B(a)] or a CSTR with recycle and bypass [Figure P14-l0(b)]. Write tracer mass balances and use an ODE solver to predict the effluent concentrations. In fact, you could build up an arsenal of tracer curves for different model systems to compare against real reactor RTD data. In this way you could deduce which model best describes the real reactor.