Particle Technology

gas cleaning

Problems 14.6

Question 2.iii


The settling chamber below is to be used to collect particles 50 micron diameter and 2000 kg m-3 density from a stream of 10 m3 s-1 of standard air. The chamber is 1.5 m high and wide and the 50 micron particle settling velocity is 0.151 m s-1 (by Stokes' Law).


settling chamber

Note that air flow in is on the left and air flow out is on the right.


The residence time vertically is (assuming settlement over the full height of a channel) (s):

  a) 110000
b) 61.2
c) 1.10
c) 55.1
Note, you need the particle settling velocity and channel height.

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