Download PDF by Thomas T. Mercer: Aerosol Technology in Hazard Evaluation

By Thomas T. Mercer

ISBN-10: 0124911501

ISBN-13: 9780124911505

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Gunn ignored image forces in deriving the charge distribution equation above and treated charge as a continuous quantity. The errors introduced into his analysis tended to cancel each other and Eq. 2 μιη [41]. If the conductivities are not equal, the curves in Fig. 8 are shifted to the left or right as A + is less than or greater than A_ , and the average absolute value of the charge is increased. At equilibrium, the magnitude of the air's conductivity does not affect either the charge distribution or the average absolute value of the charge.

0. If the right-hand side of Eq. G 2 (0,a) then Ι(θ) is the intensity of the scattered light at the angle 0, for RayleighGans scattering. The function G(0, a) has been tabulated by van de Hülst [66]. Again, the ratio ixji2 is proportional to l/cos 2 0, but is not a function of particle size. Now, more light is scattered forward than backward. 1 μτη diameters. 3 MIE SCATTERING As the particle size increases beyond the region described by the Rayleigh-Gans approximation, the scattering relationship becomes very complex and, up to values of 2a (m— 1) > 1, the exact Mie theory is necessary.

B) Charge Distributions of Airborne Particles. Whatever the charge on an aerosol at the time of its formation, it will subsequently tend toward an equilibrium condition that will depend only on the electrical conductivity of the air around it. The electrical conductivity of the air is due to the presence of ions produced primarily by the radioactive gases, radon and thoron, and their decay products in air, by radioactivity in soil, and by cosmic radiation. The electrical conductivity λ of air is the current per unit electric field strength that would flow across each square centimeter of a plane perpendicular to the direction of the electric field.

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Aerosol Technology in Hazard Evaluation by Thomas T. Mercer


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