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• W2165436165 abstract "The extent to which laryngeal-induced flow features penetrate into the upper tracheobronchial (TB) airways and their related impact on particle transport and deposition are not well understood. The objective of this study was to evaluate the effects of including the laryngeal jet on the behavior and fate of inhaled aerosols in an approximate model of the upper TB region. The upper TB model was based on a simplified numerical reproduction of a replica cast geometry used in previous in vitro deposition experiments that extended to the sixth respiratory generation along some paths. Simulations with and without an approximate larynx were performed. Particle sizes ranging from 2.5 nm to 12 μm were considered using a well-tested Lagrangian tracking model. The model larynx was observed to significantly affect flow dynamics, including a laryngeal jet skewed toward the right wall of the trachea and a significant reverse flow in the left region of the trachea. Inclusion of the laryngeal model increased the tracheal deposition of nano- and micrometer particles by factors ranging from 2 to 10 and significantly reduced deposition in the first three bronchi of the model. Considering localized conditions, inclusion of the laryngeal approximation decreased deposition at the main carina and produced a maximum in local surface deposition density in the lobar-to-segmental bifurcations (G2–G3) for both 40-nm and 4-μm aerosols. These findings corroborate previous experiments and highlight the need to include a laryngeal representation in future computational and in vitro models of the TB region." @default.
• W2165436165 created "2016-06-24" @default.
• W2165436165 creator A5003276799 @default.
• W2165436165 creator A5014031477 @default.
• W2165436165 creator A5045981743 @default.
• W2165436165 date "2008-06-01" @default.
• W2165436165 modified "2023-10-16" @default.
• W2165436165 title "Effects of the laryngeal jet on nano- and microparticle transport and deposition in an approximate model of the upper tracheobronchial airways" @default.
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• W2165436165 doi "https://doi.org/10.1152/japplphysiol.01233.2007" @default.
• W2165436165 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18388247" @default.
• W2165436165 hasPublicationYear "2008" @default.
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