Publication detail
Investigation of the Airflow inside Realistic and Semi-Realistic Replicas of Human Airways
LÍZAL, F. JEDELSKÝ, J. BĚLKA, M. ZAREMBA, M. MALÝ, M. JÍCHA, M.
Czech title
Zkoumání proudění vzduchu uvnitř realistické a semi-realistické repliky lidských dýchacích cest
English title
Investigation of the Airflow inside Realistic and Semi-Realistic Replicas of Human Airways
Type
conference paper
Language
en
Original abstract
Measurement of velocity in human lungs during breathing cycle is a challenging task for researchers, since the measuring location is accessible only with significant difficulties. A special measuring rig consisting of optically transparent replica of human lungs, breathing simulator, particle generator and Laser-Doppler anemometer was developed and used for investigation of the velocity in specific locations of lungs during simulated breathing cycle.Experiments were performed on two different replicas of human lungs in corresponding measuring points tofacilitate the analysis of the influence of the geometry and its simplification on the flow. The analysis of velocity course and turbulence intensity revealed that special attention should be devoted to the modelling of vocal cords position during breathing, as the position of laryngeal jet created by vocal cords significantly influences velocity profiles in trachea. The shapes of velocity courses during expiration proved to be consistent for both replicas; however magnitudes of peak expiratory velocity differ between the corresponding measuring points in both the replicas.
Czech abstract
Měření rychlosti v lidských plic při dýchání cyklus je náročný úkol pro výzkumníky, protože měřicí poloha je přístupná pouze se značnými obtížemi. Speciální měřicí souprava se skládá z opticky transparentní repliky lidských plíc, dýchacího simulátoru, generátoru částic a Laser-Doppler anemometru, která byla vyvinuta a použita pro zkoumání rychlosti v určitých lokalitách plíc při simulovaném dýchacím cyklu. Experimenty byly provedeny na dvou různých replikách lidských plic v odpovídajících měřicích bodech což umožnilo analýzu vlivu geometrie a jejího zjednodušení na tok vzduchu. Analýza rychlosti průběhu a intenzity turbulence ukázala, že zvláštní pozornost by měla být věnována modelování hlasivek během dýchání, neboť poloha hrtanového proudu vytvořená hlasivkami výrazně ovlivňuje rychlostní profily v průdušnici. Tvary rychlostních profilů při výdechu se ukázala být konzistentní pro obě repliky, avšak maxima výdechové rychlosti se liší mezi odpovídajícími měřicími body v replikách.
English abstract
Measurement of velocity in human lungs during breathing cycle is a challenging task for researchers, since the measuring location is accessible only with significant difficulties. A special measuring rig consisting of optically transparent replica of human lungs, breathing simulator, particle generator and Laser-Doppler anemometer was developed and used for investigation of the velocity in specific locations of lungs during simulated breathing cycle.Experiments were performed on two different replicas of human lungs in corresponding measuring points tofacilitate the analysis of the influence of the geometry and its simplification on the flow. The analysis of velocity course and turbulence intensity revealed that special attention should be devoted to the modelling of vocal cords position during breathing, as the position of laryngeal jet created by vocal cords significantly influences velocity profiles in trachea. The shapes of velocity courses during expiration proved to be consistent for both replicas; however magnitudes of peak expiratory velocity differ between the corresponding measuring points in both the replicas.
Keywords in English
laser-doppler anemometry, lung replica, lung flow
RIV year
2015
Released
06.05.2015
Publisher
EDP Sciences
Location
Francie
ISSN
2100-014X
Book
EPJ Web of Conferences
Volume
92
Number
2015
Pages from–to
1–8
Pages count
8
BIBTEX
@inproceedings{BUT111792,
author="František {Lízal} and Jan {Jedelský} and Miloslav {Bělka} and Matouš {Zaremba} and Milan {Malý} and Miroslav {Jícha},
title="Investigation of the Airflow inside Realistic and Semi-Realistic Replicas of Human Airways",
booktitle="EPJ Web of Conferences",
year="2015",
volume="92",
number="2015",
month="May",
pages="1--8",
publisher="EDP Sciences",
address="Francie",
issn="2100-014X"
}