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Deposition of Submicron Charged Spherical Particles in the Trachea of the Human Airways

H.O. Åkerstedt1
1Luleå University of Technology, Luleå, Sweden

Streamlines concentration and electric field in the region close to the first ring

This paper presents a numerical study of the deposition of submicron charged spherical particles caused by convection, Brownian and turbulent diffusion in a pipe with a smooth wall and with a cartilaginous ring wall structure (see figure). The model is supposed to describe deposition of charged particles in generation 0 (trachea) of the human lung.The problem is defined by solving the fluid flow problem with the aid of a low-Reynolds number k-epsilon model combined with a diffusion equation for the Brownian motion and Poisson's equation for the electrostatic field. Deposition results using COMSOL Multiphysics are compared with an analytic solution for the case of a fully-developed turbulent flow in an airway with a smooth wall.

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