Experimental investigation of the transitional bronchial velocity distribution using stereo scanning PIV

Experimental investigation of the transitional bronchial velocity distribution using stereo scanning PIV
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使用立体扫描 PIV 进行移行支气管速度分布的实验研究

DOI:
10.1007/s00348-011-1103-5
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发表时间:
2012
影响因子:
2.4
通讯作者:
SchröderW.
SchröderW.
中科院分区:
工程技术3区
文献类型:
--
作者:
Schröder;van Overbrüggen;SchröderW.

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本文对一个真实的透明人体肺模型的非定常流场进行了实验分析。该模型由支气管树到第三代分叉组成。空间焦点在右主支气管和随后的叶支气管之间的第二分叉处,而时间焦点在从吸气到呼气的过渡处。由于流场的高度三维和非定常的字符,时间分辨的3D-3C测量使用准体积立体扫描粒子图像测速技术进行。测量涵盖了整个支气管横截面,并在一个峰值雷诺数ReD = 1,420(代表静息呼吸)下,在两个沃默斯利数α1= 3.4和α2= 4.2时进行测量。流场的时间和空间发展的三个时间状态,在六个平行的平面。测量结果显示了不同大小和位置的旋涡结构的发展。证明了α2进入右上级支气管的质量流量增加、流动结构的频率依赖性相移以及呼气相开始时的不均匀流出。
An experimental analysis of the unsteady flow field in a realistic, transparent model of the human lung is presented. The model consists of the bronchial tree up to the third generation of bifurcation. The spatial focus is on the second bifurcation between the right main bronchus and the subsequent lobe bronchi, whereas the temporal focus is on the transition from inspiration to expiration. Due to the highly three-dimensional and unsteady character of the flow field, time-resolved 3D-3C measurements are performed using quasi-volumetric stereo scanning particle-image velocimetry. The measurements cover the total bronchial cross-section and are taken for two Womersley numbers of α1= 3.4 and α2= 4.2 at one peak Reynolds number ofReD= 1,420, representing breathing at rest. The temporal and spatial development of the flow field is presented for three temporal states in six parallel planes. The measurements show the development of vortical structures of varying size and location. An increased mass flux into the right superior bronchus for α2, a frequency-dependent phase shift of the flow structures, and a heterogeneous outflow at the beginning of the expiration phase are evidenced.
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发表时间: 2004-06-01
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