Discussion
A cyclone has a cut diameter of \( 12 \) micrometres. Halving the body diameter, with efficiency scaling as the square root of the body diameter, gives a cut diameter of about
Answer: D
The cut diameter falls by \( \sqrt{0.5} = 0.707 \), giving \( 12 \times 0.707 = 8.5 \) micrometres. The pressure drop rises steeply at the same time, which is the standing trade in cyclone design and the reason multiclones exist.
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