Comparison of micro- and nano-size particle depositions in a human upper airway model [An article from: Journal of Aerosol Science]

This digital document is a journal article from Journal of Aerosol Science, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Simulation results of microparticle and nanoparticle deposition patterns, local concentrations, and segmental averages are contrasted for a human upper airway model starting from the mouth to planar airway generation G3 under different inspiratory flow conditions. Specifically, using a commercial finite-volume software with user-supplied programs as a solver, the Euler-Euler (nanoparticles) or the Euler-Lagrange (microparticles) approach was employed with a low-Reynolds-number k-@w model for laminar-to-turbulent airflow and submodels for particle-phase randomization. The results show that depositions of both micro- and nano-size particles vary measurably in the human upper airways; however, the deposition distributions are much more uniform for nanoparticles. The maximum deposition enhancement factor, which is defined as the ratio of local to average deposition concentrations, ranges from about 40 to 2400 for microparticles and about 2 to 11 for nanoparticles with inspiratory flow rates in the range of 15=