S0203-1-4 中枢気道内振動流に発生する乱れのPIV計測(上部気道の輸送現象)

概要

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To reveal the nature of turbulence in a lung, the measurements of turbulence in the oscillatory flow in realistic model human central airways were made by particle image velocimetry (PIV). The transparent silicon model of multi-branching airways was fabricated from X-ray CT images by rapid prototyping. The multi-branching airways comprise trachea, right and left bronchi, and airway diameters range from 14 to 2 mm. The working fluid was an aqueous solution of glycerin, and plastic beads were added as seed particles. Sinusoidal oscillatory flow was produced by a pulse generator comprised of bellows pump. Velocities were measured in the coronal plane at the trachea, right and left bronchus with an Argon Laser sheet. The velocity data were processed to obtain the ensemble averaged velocity and turbulent intensity. The spatial and temporal variations of turbulent intensity were strongly dependent on the airway geometry and the phase of oscillatory flow.
2009-09-12