人体肺气道模型分支的几何变化对压力损失的影响。

Effect of geometric variations on pressure loss for a model bifurcation of the human lung airway.

机构信息

Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea.

出版信息

J Biomech. 2011 Apr 7;44(6):1196-9. doi: 10.1016/j.jbiomech.2011.02.011. Epub 2011 Feb 26.

DOI:10.1016/j.jbiomech.2011.02.011

Abstract

Characteristics of pressure loss (ΔP) in human lung airways were numerically investigated using a realistic model bifurcation. Flow equations were numerically solved for the steady inspiratory condition with the tube length, the branching angle and flow velocity being varied over a wide range. In general, the ΔP coefficient K showed a power-law dependence on Reynolds number (Re) and length-to-diameter ratio with a different exponent for Re≥100 than for Re<100. The effect of different branching angles on pressure loss was very weak in the smooth-branching airways.

摘要

使用现实的支气管模型分叉，对人体肺部气道的压力损失（ΔP）特性进行了数值研究。对具有长径比和流速的稳定吸气条件下的流动方程进行了数值求解，范围很广。一般来说，ΔP 系数 K 与雷诺数（Re）和长径比呈幂律关系，对于 Re≥100 的情况，其指数与 Re<100 的情况不同。在光滑分支气道中，不同分支角度对压力损失的影响非常微弱。