Abstract
To clarify flow phenomena in avian lung, oscillatory flow in a right angle branch was numerically studied in the range of dimensionless tidal volume, v_γ/a^3, of 10 to 80, and dimensionless frequency, α^2, of 8 to 40. The results show that the pressure drop caused by separation vortex at the entrance of side-daughter tube in the inspiratory phase drives unidirectional (circular) flow from the side-daughter tube to the daughter tube. Due to convective inertia, the unidirectional flow persists even in the expiratory phase, in which no vortex exists at the entrance of the side-daughter tube. By visualizing the streaming of fresh gas inspired from the mother tube, it is also shown that the unidirectional flow strongly enhances axial gas transportation in the process of avian respiration.
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