where w is in meters per second, p is the dielectric constant for the particles (which typically lies between 1.50 and 2.40), Ec is the strength of the charging field (V/m), Ep is the collecting field strength (V/m), dp is the particle diameter (^m), Kc is the Cunningham correction factor for particles with a diameter less than roughly 5 ^m (dimensionless), and Vg is the gas viscosity (kg/m/sec).

Weighted Wire

Rigid Frame (bedspring type)

Rigid Frame (mast type)

FIGURE 6-16. Rigid discharge electrode designs. (From Elliot, T. C., Ed., Standard Handbook of Powerplant Engineering, McGraw-Hill, New York, 1989. With permission.)

The Cunningham correction factor in Equation (6-80) is defined as [6]:

where k is the mean free path of the molecules in the gas phase. This quantity is given by:

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