By Thomas T. Mercer
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Extra resources for Aerosol Technology in Hazard Evaluation
13]         a KR = FRI^U(nS)ll2\ FR is the experimental resistance force. *C R -R. 12)]. be made to simplify the estimation of the fluid resistance for nonspherical particles. 10) where D is some characteristic "diameter" of the particle and KR is a resistance shape factor. Gurel et al. * Following their suggestion, Eq. 10) with D = (S/n)l/2, has been used to calculate KR for a variety of isometric shapes for which data are available in the literature. 2. Values of # R near unity indicate that the drag on the nonspherical particle is close to that on a sphere of the same surface area.
The reflected and refracted light is plane polarized, but the effect is not useful for discriminating particle sizes. 0. 5 SCATTER FROM PARTICLES OF IRREGULAR SHAPE The discussion above refers to individual transparent spherical particles. If the particles are irregular in shape, the scattering will be different because a particle of a given size will have a scattering effect that will depend on its orientation. A number of irregular particles of the same size, randomly oriented with respect to the incident beam, will scatter light in a somewhat more diffuse manner than the same concentrations of spheres.
All of the fluctuations predicted by the Mie theory have been damped out. This is partly due to particle orientation, but due also to the spread in particle sizes, since the diameters represent the averages of size increments obtained by repeated sedimentation. For the larger particles, Fig. 19 shows that the scattering is almost entirely in the forward direction. Although the values of a are quite large, the value of m is so low that the scattering does not fall in the region of the Mecke approximation.
Aerosol Technology in Hazard Evaluation by Thomas T. Mercer