Discussion
Match each mechanism in List I with the device that uses it in List II.
List I
A. Centrifugal inertia
B. Impaction on atomised droplets
C. Electrical migration
D. Sieving on a dust cake
List II
1. Venturi scrubber
2. Cyclone
3. Fabric filter
4. Electrostatic precipitator
Select the correct match.
Answer: D
Three of these mechanisms depend on the particle's mass and one does not, which is why the precipitator handles the fine fraction so much better. Understanding the mechanism predicts the efficiency curve against particle size.
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