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Three-dimensional inspiratory flow in the upper and central human airways

Abstract

The steady inspiratory flow through an anatomically accurate model of the human airways was studied experimentally at a regime relevant to deep inspiration for aerosol drug delivery. Magnetic resonance velocimetry was used to obtain the three-component, mean velocity field. A strong, single-sided streamwise swirl was found in the trachea and persists up to the first bifurcation. There, the swirl and the asymmetric anatomy impact both the streamwise momentum distribution and the secondary flows in the main bronchi, with large differences compared to what is found in idealized branching tubes. In further generations, the streamwise velocity never recovers a symmetric profile and the relative intensity of the secondary flows remains strong. Overall, the results suggest that, in real human airways, both streamwise dispersion (due to streamwise gradients) and lateral dispersion (due to secondary flows) are very effective transport mechanisms. Neglecting the extrathoracic airways and idealizing the bronchial tree may lead to qualitatively different conclusions.

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Acknowledgments

This research was supported in part by the US Army Research Laboratory, through the Army High Performance Computing Research Center, Cooperative Agreement W911NF-07-0027. Clement Kleinstreuer (North Carolina State University) kindly provided the segmented model of the subject-specific airways. We are thankful to Gianluca Iaccarino (Stanford, Mechanical Engineering), Eric Shaqfeh and Jorge Bernate (Stanford, Chemical Engineering), Carlos Milla and Peter Kao (Stanford, Pulmonary Medicine), Kevin Stapleton (Allergan Corp, Mountain View, CA), and Clement Kleinstreuer for their valuable insight during several fruitful discussions.

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Correspondence to A. J. Banko.

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Banko, A.J., Coletti, F., Schiavazzi, D. et al. Three-dimensional inspiratory flow in the upper and central human airways. Exp Fluids 56, 117 (2015). https://doi.org/10.1007/s00348-015-1966-y

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Keywords

  • Particle Image Velocimetry
  • Secondary Flow
  • Streamwise Velocity
  • Main Bronchus
  • Left Main Bronchus