Particle Diameter

FIG. 5.18.3 Typical grade efficiency curves as computed from Efficiency = exp (AdBJ.

Particle Diameter

FIG. 5.18.3 Typical grade efficiency curves as computed from Efficiency = exp (AdBJ.

5.18.3). Because collection efficiency is also a function of particle density, the concept of the aerodynamic particle diameter must be considered. The aerodynamic diameter of an aerosol particle is the diameter of a unit density sphere (density = 1 g/cm3) which has the same settling velocity as the particle. With this definition, the relationship of a spherical particle of diameter ds and density p to its aerodynamic diameter da is expressed as:

For particles with diameters of several micrometers or less, a slip correction term Cc must be included in the aerodynamic diameter conversion as follows:

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