PMID: 11340875May 9, 2001Paper

Oscillatory flow and gas transport through a symmetrical bifurcation

Journal of Biomechanical Engineering
H FujiokaKazuo Tanishita

Abstract

Axial gas transport due to the interaction between radial mixing and radially nonuniform axial velocities is responsible for gas transport in thick airways during High-frequency oscillatory ventilation (HFO). Because the airways can be characterized by a bifurcating tube network, the secondary flow in the curved portion of a bifurcating tube contributes to cross-stream mixing. In this study the oscillatory flow and concentration fields through a single symmetrical airway bifurcating tube model were numerically analyzed by solving three-dimensional Navier-Stokes and mass concentration equations with the SIMPLER algorithm. The simulation conditions were for a Womersley number, alpha = 9.1 and Reynolds numbers in the parent tube between 200 and 1000, corresponding to Dn2/alpha 4 in the curved portion between 2 and 80, where Dn is Dean number. For comparison with the results from the bifurcating tube, we calculated the velocity and concentration fields for fully developed oscillatory flow through a curved tube with a curvature rate of 1/10, which is identical to the curved portion of the bifurcating tube. For Dn2/alpha 4 < or = 10 in the curved portion of the bifurcating tube, the flow divider and area changes dominate the axial ga...Continue Reading

References

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Aug 1, 1997·Journal of Biomechanical Engineering·M NishidaK Tanishita

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Citations

Jan 4, 2006·Annals of Biomedical Engineering·Chris D Bertram, Donald P Gaver
Feb 14, 2019·Journal of Aerosol Medicine and Pulmonary Drug Delivery·Toshihiro SeraMasao Tanaka
Jan 30, 2008·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Dongyoub LeeAnthony S Wexler

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