Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways
Turbulence in the oscillatory flow in realistic model human central airways was measured by particle image velocimetry (PIV) to reveal the nature of turbulence in a lung. The transparent silicone model of multi-branching airways was fabricated from X-ray CT images by rapid prototyping. The multi-bra...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2012-03-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/7/1/7_1_53/_pdf/-char/en |
| _version_ | 1818753742489518080 |
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| author | Gaku TANAKA Akihiro HATORI Ryosuke TAKANO |
| author_facet | Gaku TANAKA Akihiro HATORI Ryosuke TAKANO |
| author_sort | Gaku TANAKA |
| collection | DOAJ |
| description | Turbulence in the oscillatory flow in realistic model human central airways was measured by particle image velocimetry (PIV) to reveal the nature of turbulence in a lung. The transparent silicone model of multi-branching airways was fabricated from X-ray CT images by rapid prototyping. The multi-branching airways comprise trachea, and right and left bronchi, with airway diameters ranging from 14 to 2 mm, respectively. Experiments were performed for a Reynolds number from 1200 to 2200 and a Womersley number from 1.9 to 2.3 in the trachea. Results showed that spatial and temporal variations of turbulent intensity strongly depends on the airway geometry and on the phase of oscillatory flow, and that expiratory flow generates strong turbulence which explosively occurs in the entire cross-section especially in the right bronchi, whereas inspiratory flow generates relatively weak turbulence near the airway wall. |
| first_indexed | 2024-12-18T05:12:12Z |
| format | Article |
| id | doaj.art-dce9fef3916b43c995970fec1cfc97cf |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-18T05:12:12Z |
| publishDate | 2012-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-dce9fef3916b43c995970fec1cfc97cf2022-12-21T21:19:53ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582012-03-0171536310.1299/jfst.7.53jfstSpatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human AirwaysGaku TANAKA0Akihiro HATORI1Ryosuke TAKANO2Graduate School of Engineering, Chiba UniversityGraduate School of Engineering, Chiba UniversityGraduate School of Engineering, Chiba UniversityTurbulence in the oscillatory flow in realistic model human central airways was measured by particle image velocimetry (PIV) to reveal the nature of turbulence in a lung. The transparent silicone model of multi-branching airways was fabricated from X-ray CT images by rapid prototyping. The multi-branching airways comprise trachea, and right and left bronchi, with airway diameters ranging from 14 to 2 mm, respectively. Experiments were performed for a Reynolds number from 1200 to 2200 and a Womersley number from 1.9 to 2.3 in the trachea. Results showed that spatial and temporal variations of turbulent intensity strongly depends on the airway geometry and on the phase of oscillatory flow, and that expiratory flow generates strong turbulence which explosively occurs in the entire cross-section especially in the right bronchi, whereas inspiratory flow generates relatively weak turbulence near the airway wall.https://www.jstage.jst.go.jp/article/jfst/7/1/7_1_53/_pdf/-char/enpipe flowoscillatory flowturbulencebio-fluid mechanicspivairwayrespiratory system |
| spellingShingle | Gaku TANAKA Akihiro HATORI Ryosuke TAKANO Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways Journal of Fluid Science and Technology pipe flow oscillatory flow turbulence bio-fluid mechanics piv airway respiratory system |
| title | Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways |
| title_full | Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways |
| title_fullStr | Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways |
| title_full_unstemmed | Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways |
| title_short | Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways |
| title_sort | spatial and temporal variation of turbulence during oscillatory flow in realistic model human airways |
| topic | pipe flow oscillatory flow turbulence bio-fluid mechanics piv airway respiratory system |
| url | https://www.jstage.jst.go.jp/article/jfst/7/1/7_1_53/_pdf/-char/en |
| work_keys_str_mv | AT gakutanaka spatialandtemporalvariationofturbulenceduringoscillatoryflowinrealisticmodelhumanairways AT akihirohatori spatialandtemporalvariationofturbulenceduringoscillatoryflowinrealisticmodelhumanairways AT ryosuketakano spatialandtemporalvariationofturbulenceduringoscillatoryflowinrealisticmodelhumanairways |