Discussion
Three of the following collect by inertia. Which does not?
Electrostatic precipitator
Cyclone
Gravity settling chamber
Venturi scrubber
Answer: B
Correct answer: Electrostatic precipitator
A precipitator charges particles and drives them to a plate by an electric field, which is not an inertial mechanism at all - and that is precisely why it works on very fine particles, whose inertia is negligible. The cyclone uses centrifugal inertia, the settling chamber gravitational settling, and the venturi impaction on droplets; all three depend on the particle’s mass and all three fail as the particle gets small.
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