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Becker, R.S., Anderson, V.E., Allen, J.D., Birkhoff, R.D. and Ferell, T.L. (1980) Electrical image deposition of charges from laminar flow in cylinders. Journal of Aerosol Science, 11, 461-466. doi:10.1016/0021-8502(80)90118-4

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• TITLE: Deposition of charged nano-particles in the human airways including effects from cartilaginous rings

  AUTHORS: Hans O. Akerstedt

  KEYWORDS: Charged Particles; Nanoparticles; Convection; Brownian motion; Deposition; Respiratory Airways; Cartilaginous Rings

  JOURNAL NAME: Natural Science, Vol.3 No.10, October 21, 2011

  ABSTRACT: This paper presents a numerical study of the deposition of spherical charged nano-particles caused by convection, Brownian diffusion and electrostatics in a pipe with a cartilaginous ring structure. The model describes the deposition of charged particles in the different generations of the tracheobronchial tree of the human lung. The upper airways are characterized by a certain wall structure called cartilaginous rings which modify the particle deposition when compared to an airway with a smooth wall. The problem is defined by solving Naver-Stokes equations in combination with a convective-diffusion equation and Gauss law for electrostatics. Three non- dimensional parameters describe the problem, the Peclet number Pe = 2ūa/D , the Reynolds number Re = ūa/v and an electrostatic parameter α=α2c0q2/(4ε0κT) . Here U is the mean velocity, a the pipe radius and D the diffusion coefficient due to Brownian motion given by D=κTCu/3πμd , where Cu is the Cunningham-factor Cu=1+λ/d(2.34+1.05exp(-0.39d/λ)) Here d is the particle diameter and λ the mean free path of the air molecules. Results are provided for generations G4-G16 of the human airways. The electrostatic parameter is varied to model different concentrations and charge numbers.