Particle Technology

gas cleaning

Problems 14.6

Question 2.viii

OK, so we can force the flow into something approaching laminar by asking for an unrealistic number of trays to be put in to our settling chamber: 385 is not sensible. However, if we could make the flow laminar, this question asks you to calculate what happens for a 25 micron particle, if you use your knowledge that we have just designed for a 50 micron particle and Stokes' settling equation you can work this one out without doing much in the way of calculations.

settling chamber

The chamber was designed to be 5 metres long for 100% collection of the 50 micron particles.

	a) 100 b) 50 c) 25 d) 0
Note, take a look at Stokes' settling equation and think how it was used in the design.