Particle Technology

gas cleaning

Problems 14.6

Question 2.iv


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 has a horizontal residence time given by 1.5WL/Q and a vertical residence time of 1.10 seconds.


settling chamber

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


Using a critical trajectory model, the length of the chamber for 100% collection efficiency at 50 microns is (m):

  a) 20
b) 10
c) 5
c) 2
Note, the critical trajectory model is where we equate the vertical and horizontal residence times.

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