Abstract
The objective of this work is to develop understanding of the local fluid dynamic mechanisms that underpin gas exchange in high-frequency oscillatory ventilation (HFOV). The flow field during HFOV was investigated experimentally using particle image velocimetry in idealized and realistic models of a single bifurcation. Results show that inspiratory and expiratory fluid streams coexist in the airway at flow reversal, and mixing between them is enhanced by secondary flow and by vortices associated with shear layers. Unsteady flow separation and recirculation occurs in both geometries. The magnitude of secondary flow is greater in the realistic model than in the idealized model, and the structure of secondary flow is quite different. However, other flow structures are qualitatively similar.
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Acknowledgments
The authors are grateful to Ms. Sue Harty and Dr. Gerard O’Sullivan of the Merlin Park Imaging Centre for providing CT images of the models. We also thank Mr. Colm Walsh and Mr. Kumar Saidha for their contributions to the development of the flow apparatus. This research was supported by the Irish Research Council for Science, Engineering and Technology, funded by the National Development Plan; the Programme for Research in Third Level Institutions; and National University of Ireland, Galway through the Millennium Research Fund.
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Heraty, K.B., Laffey, J.G. & Quinlan, N.J. Fluid Dynamics of Gas Exchange in High-Frequency Oscillatory Ventilation: In Vitro Investigations in Idealized and Anatomically Realistic Airway Bifurcation Models. Ann Biomed Eng 36, 1856–1869 (2008). https://doi.org/10.1007/s10439-008-9557-1
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DOI: https://doi.org/10.1007/s10439-008-9557-1