3. Design Considerations
Collection EfficiencY
From the preceding equation, we see that, in theory, the smallest diameter of particles
collected with 100% efficiency is directly related to gas viscosity and inlet duct width,
and inversely related to the number of effective tums, inlet gas velocity, and density
difference between the particles and the gas. In practice, collection effrciency does, in
fact, depend on these parameters. However, the model has a major flaw: It predicts that
àt particteslarger than do will be collected with 100% efficiency, which is incorrect.