Discussion
Consider the following statements about choosing a non-ideal flow model.
1. The dispersion model suits tubular vessels with small deviations.
2. The tanks in series model suits vessels with substantial back mixing.
3. The choice never affects the predicted conversion.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 give the usual basis of the choice: the dispersion model suits tubular vessels departing slightly from plug flow, and tanks in series suits vessels with substantial back mixing, where a small \( N \) describes the behaviour naturally. Statement 3 is wrong - the two models give different conversions for the same variance, and the difference grows as the deviation from plug flow increases.
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