Time-resolved characteristics of oscillatory particle-laden air flow in a realistic human airway model

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F24%3APU151400" target="_blank" >RIV/00216305:26210/24:PU151400 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.euromechflu.2024.01.003" target="_blank" >https://doi.org/10.1016/j.euromechflu.2024.01.003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.euromechflu.2024.01.003" target="_blank" >10.1016/j.euromechflu.2024.01.003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Time-resolved characteristics of oscillatory particle-laden air flow in a realistic human airway model

Popis výsledku v původním jazyce

Human airways represent a complex flow system with a spatially and temporally variable character of air flow during respiration. In this paper, we experimentally studied the oscillatory flow of air with monodispersed micron-sized liquid particles in a transparent, anatomically realistic model of human upper airways and several bronchi generations using phase-Doppler anemometry (PDA). The PDA provided point-wise high-frequency measurements of axial velocities of individual aerosol particles in multiple positions of the airways (in the trachea and the upper bronchi) for three breathing regimes with a sinusoidal course. Typical time-resolved velocity plots at several positions within the model were documented and analysed using dimensionless criteria. Local mean air velocity and turbulence time-lines disclosed specific flow dynamic features in the multiple bifurcation system, namely the transit of vortical structures, oscillations induced by flow reversals, and inspiratory flow separations behind bifurcations. The results elucidated the laminar, transitional and turbulent flows during inspiratory and expiratory breathing phases. The character of the flow varies significantly with position in the airways, while the breathing regime has a generally low effect on the flow character. Inspection of the flow in the terminal branches indicated the need to add further branches for more realistic results there.

Název v anglickém jazyce

Time-resolved characteristics of oscillatory particle-laden air flow in a realistic human airway model

Popis výsledku anglicky

Human airways represent a complex flow system with a spatially and temporally variable character of air flow during respiration. In this paper, we experimentally studied the oscillatory flow of air with monodispersed micron-sized liquid particles in a transparent, anatomically realistic model of human upper airways and several bronchi generations using phase-Doppler anemometry (PDA). The PDA provided point-wise high-frequency measurements of axial velocities of individual aerosol particles in multiple positions of the airways (in the trachea and the upper bronchi) for three breathing regimes with a sinusoidal course. Typical time-resolved velocity plots at several positions within the model were documented and analysed using dimensionless criteria. Local mean air velocity and turbulence time-lines disclosed specific flow dynamic features in the multiple bifurcation system, namely the transit of vortical structures, oscillations induced by flow reversals, and inspiratory flow separations behind bifurcations. The results elucidated the laminar, transitional and turbulent flows during inspiratory and expiratory breathing phases. The character of the flow varies significantly with position in the airways, while the breathing regime has a generally low effect on the flow character. Inspection of the flow in the terminal branches indicated the need to add further branches for more realistic results there.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20300 - Mechanical engineering

Projekt

<a href="/cs/project/GA22-20357S" target="_blank" >GA22-20357S: Měření a počítačová simulace transportu vláknitých aerosolů v proudění s vysokými gradienty rychlosti a interakce vláken se stěnou</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS

ISSN

0997-7546

e-ISSN

1873-7390

Svazek periodika

105

Číslo periodika v rámci svazku

May-June

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

19

Strana od-do

219-237

Kód UT WoS článku

001172278800001

EID výsledku v databázi Scopus

2-s2.0-85183842900