Discussion
Consider the following statements about the tanks in series model.
1. The fitted number of tanks need not be a whole number.
2. A large number indicates behaviour close to plug flow.
3. The number must equal the number of physical vessels.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: \( N \) is a fitted parameter obtained from the variance of the curve and need not be an integer, and a large value means a narrow distribution and behaviour approaching plug flow, with \( N=1 \) being a single stirred tank. Statement 3 confuses the model with the plant - a single vessel may fit as five tanks, and five vessels in series may fit as three.
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