Abstract
The dynamic behavior of acicular-shaped aerosol particles subjected to electric fields is discussed, and equations are developed to model the motion of such particles under the influence of rotating and oscillating fields. Effects of gas viscosity, Brownian bombardment, high-Reynolds number motion, and particle conductivity and dimensions are treated. Several different electric field configurations can be applied to align and/or rotate airborne particles of fibrous shape: pulsed d.c., sinusoidal, rotational, and oscillatory. For practical geometries, field intensities are limited to about 10 kV/cm by interelectrode breakdown in air. Rotational frequencies of up to 10 3 rad/s may be imparted to fibers longer than about 1 μm. Deviations from Stokesian behavior become significant only when the product of fiber projected area and rotational frequency exceeds approximately 10 8 μm 2 rad/s. It appears feasible that curled or bent fibers, such as chrysotile asbestos, may be straightened during exposure to field intensities of several kV/cm. The application of rotational electrodynamics to the real-time measurement of airborne fibers is discussed.
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