Discussion
Consider the following statements about cyclones:
1. Cut diameter is the size collected with fifty per cent efficiency.
2. A narrower body gives a smaller cut diameter.
3. A narrower body also gives a lower pressure drop.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the cut diameter is the fifty per cent point, and a narrower body raises the centrifugal acceleration \( v^2/r \) and so lowers it. Statement 3 is the reverse - a narrower body means higher velocities and a higher pressure drop. That is the trade a multiclone makes: many small cyclones in parallel give a fine cut at a substantial cost in fan power.
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