Discussion
Consider the following statements about multi-cell boxes:
1. Every cell must have the same rate of twist.
2. The net flow in a shared web is the difference of the two cell flows.
3. Each cell can be analysed entirely independently.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the cells twist together, and the shared web carries the difference of the two circulating flows. Statement 3 is exactly what makes the multi-cell problem harder than the single-cell one - the cells are coupled through their shared webs and through the common rate of twist, and must be solved simultaneously.
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