Particle-charge magnitudes in electrostatic precipitation

The charge magnitudes acquired by fly-ash particles in the process of electrostatic precipitation have been measured over ranges of treatment times, gas velocities and particle diameters. The measurements were generally in agreement with existing theories with two notable exceptions: the rate of charging was considerably lower than predicted and the charge acquired by particles larger than about 50¿m was found to increase more rapidly with diameter than the square law established for particles below this size. The latter effect is believed to be due to the greater surface area of the more irregular larger particles.