Abstract
A universal bifurcation model developed to study a variety of transport phenomena in the human lung is described. This paper focuses on technical specifications of the model and on local particle concentration patterns within post-bend and post-bifurcation zones. Results are presented for uniformly sized solid microspheres, 1.4 μm in diameter, over a range of steady air velocity conditions. It is shown that local particle concentration can be significantly higher than the initial concentration, which demonstrates that the particle phase component of the aerosol is not incompressible (de la Mora, 1985, Aerosol Sci. Technol. 4, 339–349; Konstandopoulos, 1990, J. Aerosol Sci. 21, 983–987), and that a significant boundary layer particle concentration enhancement in the post-bend,/bifurcation zone can be produced by the vortices originated in bends and bifurcations.
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