Discussion
A settling chamber \( 6 \) m long and \( 2 \) m high passes gas at \( 0.6 \) m/s. The minimum settling velocity for complete collection is
Answer: C
Residence time is \( 6/0.6 = 10 \) s, and a particle must fall 2 m in that time, requiring \( 0.20 \) m/s. Settling velocities of that order belong to particles well above a hundred micrometres, which shows how limited the device is.
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