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首页> 外文期刊>Journal of Fluid Science and Technology >Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways
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Spatial and Temporal Variation of Turbulence during Oscillatory Flow in Realistic Model Human Airways

机译：逼真的模型人类呼吸道中湍流时湍流的时空变化

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Turbulence in the oscillatory flow in realistic model human central airways was measured by particle image velocimetry (PIV) to reveal the nature of turbulence in a lung. The transparent silicone model of multi-branching airways was fabricated from X-ray CT images by rapid prototyping. The multi-branching airways comprise trachea, and right and left bronchi, with airway diameters ranging from 14 to 2 mm, respectively. Experiments were performed for a Reynolds number from 1200 to 2200 and a Womersley number from 1.9 to 2.3 in the trachea. Results showed that spatial and temporal variations of turbulent intensity strongly depends on the airway geometry and on the phase of oscillatory flow, and that expiratory flow generates strong turbulence which explosively occurs in the entire cross-section especially in the right bronchi, whereas inspiratory flow generates relatively weak turbulence near the airway wall.
机译：通过粒子图像测速仪（PIV）测量现实模型人的中央气道中的振荡流中的湍流，以揭示肺中湍流的性质。通过快速原型制作，从X射线CT图像制作了多分支气道的透明有机硅模型。多分支气道包括气管，左右支气管，气道直径分别为14到2 mm。在气管中进行了雷诺数为1200至2200和沃默斯利数为1.9至2.3的实验。结果表明，湍流强度的时空变化在很大程度上取决于气道的几何形状和振荡流的相位，而呼气流会产生强烈的湍流，这种湍流会在整个横截面中发生爆炸，特别是在右支气管中，而吸气流会产生气道壁附近的湍流相对较弱。

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