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Particle Filtration
The theoretical discussion to this point has been mostly concerned with the theories
of flow through porous media. It is necessary to understand the flow behavior
through a nonwoven filter medium in order to develop theories for the separation of
particles in that flow. Most of the tbl|owing discussion will be based on the separation
of particles in gas streams, particularly air-borne particles.

Single fiber theory was developed for filtration of aerosol particles from an air
stream.
At some distance upstream of this fiber is a stream of width y. (m), where all the
particles in this stream are the ones that will strike the fiber, whose diameter is df (m).
The single fiber efficiency is then...