Discussion
An engineer proposes a settling chamber to meet a PM2.5 standard. This is
Answer: B
Correct answer: Unworkable: settling velocity is far too low
A 2.5 micrometre particle settles at a fraction of a millimetre per second, so a chamber long enough for it to reach the floor before the gas leaves would be measured in hundreds of metres. Lowering the gas velocity helps only in proportion, and no practical length can close the gap. A settling chamber is a pre-cleaner for material above about fifty micrometres, and nothing else.
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