Diffusional Transport of Nonspherical Aerosol Particles

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Abstract
The diffusional losses of spheres and particles consisting of two equal spheres in contact (dumbbells) from laminar aerosol-flows on surfaces of cylindrical tubes were measured with a laser aerosol size spectrometer. From losses of the nonspherical particles in the tubes a diameter could be calculated for a ficticious sphere that would have been lost in the tubes with the same average probability as the nonspherical particle. This diameter is termed the thermodynamic diameter of the nonspherical particle. It was found to be larger than the volume equivalent diameter of the nonspherical particles. The shape factors were 1.052 for dumbbells consisting of two 82 nm spheres and 1.069 for dumbbells consisting of two 102 nm spheres.