Abstract
The dispersion mechanism of particles in a gas is discussed from the viewpoint of nonequilibrium thermodynamics and kinetic theory. A heuristic equation, based on the quasi-Lorentz model developed by Mason and other workers, for the particle velocity in the presence of a gradient of pressure and temperature is proposed for all values of a parameters, wheres is defined as the ratio of the particle radiusr to a multiple of the mean free path, λ, of the gas medium. A schematic calculation demonstrates the conditions under which molecular diffusion could play a role in a realistic atmospheric pollution problem.
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Paper dedicated to Professor Edward A. Mason.
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Hanley, H.J.M. Particle dispersion in a gas. Int J Thermophys 18, 947–955 (1997). https://doi.org/10.1007/BF02575240
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DOI: https://doi.org/10.1007/BF02575240