Physics of Fluids, volume 14, issue 2, pages 862-880
Transient airflow structures and particle transport in a sequentially branching lung airway model
1
Center for Environmental Medicine and Lung Biology, University of North Carolina, Chapel Hill, North Carolina 27599
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Publication type: Journal Article
Publication date: 2002-02-01
Journal:
Physics of Fluids
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 4.6
ISSN: 10706631, 10897666, 00319171
Condensed Matter Physics
Mechanical Engineering
Mechanics of Materials
Computational Mechanics
Fluid Flow and Transfer Processes
Abstract
Considering oscillatory laminar incompressible three-dimensional flow in triple planar and nonplanar bifurcations representing generations three to six of the human respiratory system, air flow fields and micron-particle transport have been simulated under normal breathing and high-frequency ventilation (HFV) conditions. A finite-volume code (CFX4.3 from AEA Technology, Pittsburgh, PA) and its user-enhanced FORTRAN programs were validated with experimental velocity data points for a single bifurcation. The airflow structures and micron-particle motion in the triple bifurcations were analyzed for a representative normal breathing cycle as well as HFV condition. While both the peak inspiratory and expiratory velocity profiles for the low Womersley case (α=0.93) agree well with those of instantaneously equivalent steady-state cases, some differences can be observed between flow acceleration and deceleration at off-peak periods or near flow reversal, especially during inspiratory flow. Similarly, the basic features of instantaneous particle motion closely resemble the steady-state case at equivalent inlet Reynolds numbers. The preferential concentration of particles caused by the coherent vortical structures was found in both inhalation and exhalation; however, it is more complicated during expiration. The effects of Womersley number and non-planar geometries as well as the variations in secondary flow intensity plus pressure drops across various bifurcations under normal breathing and HFV conditions were analyzed as well. This work may elucidate basic physical insight of aerosol transport relevant in dosimetry-and-health-effect studies as well as for drug aerosol delivery analyses.
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Citations by publishers
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- We do not take into account publications without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Zhang Z., Kleinstreuer C. Transient airflow structures and particle transport in a sequentially branching lung airway model // Physics of Fluids. 2002. Vol. 14. No. 2. pp. 862-880.
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Zhang Z., Kleinstreuer C. Transient airflow structures and particle transport in a sequentially branching lung airway model // Physics of Fluids. 2002. Vol. 14. No. 2. pp. 862-880.
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TY - JOUR
DO - 10.1063/1.1433495
UR - https://doi.org/10.1063/1.1433495
TI - Transient airflow structures and particle transport in a sequentially branching lung airway model
T2 - Physics of Fluids
AU - Zhang, Z.
AU - Kleinstreuer, C.
PY - 2002
DA - 2002/02/01 00:00:00
PB - American Institute of Physics (AIP)
SP - 862-880
IS - 2
VL - 14
SN - 1070-6631
SN - 1089-7666
SN - 0031-9171
ER -
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@article{2002_Zhang,
author = {Z. Zhang and C. Kleinstreuer},
title = {Transient airflow structures and particle transport in a sequentially branching lung airway model},
journal = {Physics of Fluids},
year = {2002},
volume = {14},
publisher = {American Institute of Physics (AIP)},
month = {feb},
url = {https://doi.org/10.1063/1.1433495},
number = {2},
pages = {862--880},
doi = {10.1063/1.1433495}
}
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MLA
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Zhang, Z., and C. Kleinstreuer. “Transient airflow structures and particle transport in a sequentially branching lung airway model.” Physics of Fluids, vol. 14, no. 2, Feb. 2002, pp. 862-880. https://doi.org/10.1063/1.1433495.