Ad. Eisner, UNIVERSAL BIFURCATION MODEL AND ITS APPLICATION TO STUDY LOCAL PARTICLE-TRANSPORT PHENOMENA IN UPPER AIRWAYS, Journal of aerosol science, 24(4), 1993, pp. 537-549
A universal bifurcation model developed to study a variety of transpor
t phenomena in the human lung is described. This paper focuses on tech
nical specifications of the model and on local particle concentration
patterns within post-bend and post-bifurcation zones. Results are pres
ented for uniformly sized solid microspheres, 1.4 mum in diameter, ove
r a range of steady air velocity conditions. It is shown that local pa
rticle concentration can be significantly higher than the initial conc
entration, 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 orig
inated in bends and bifurcations.