|本期目录/Table of Contents|

PM2.5细颗粒物在肺腺泡区运动及沉积的数值模拟(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2015年4期
页码:
264-270
栏目:
精密测量
出版日期:
2015-07-15

文章信息/Info

Title:
Numerical Simulation on Movement and Deposition of PM2.5 in Pulmonary Acinus
作者:
张鸿雁 李彦辉 崔海航
西安建筑科技大学环境与市政工程学院,西安 710055
Author(s):
Zhang Hongyan Li Yanhui Cui Haihang
School of Environment and Municipal Engineering,Xi’an University of Architecture and Technology, Xian 710055,China
关键词:
肺腺泡PM2.5数值模拟动网格颗粒沉积
Keywords:
pulmonary acinus PM2.5 numerical simulation moving mesh particle deposition
分类号:
R318
DOI:
10.13494/j.npe.20150023
文献标识码:
A
摘要:
采用数值模拟方法研究了肺腺泡区气流和可吸入颗粒的运动沉积规律.区别于以往的单级固定壁研究方法,本文利用Weibel-A模型中的肺腺泡几何数据,建立了完整覆盖0~8级肺腺泡区的二维几何模型,并通过动边界方法引入节律收缩/扩张的呼吸动力学机制.随后针对正常成年人平静呼吸状态,研究了人体肺腺泡区的非定常流场特性.在此基础上,在拉格朗日框架下研究了可吸入颗粒物的运动,统计了颗粒物的沉积率并对主要沉积机理进行了分析.结果表明:布朗扩散是粒径较小颗粒(0.01 μm≤dp≤0.50 μm)传输和沉积的主导因素,而重力沉降是粒径较大颗粒(0.50 μm
Abstract:
The numerical simulation method is adopted to analyse the characteristics of the airflow and the movement and deposition of inhalational particles in human pulmonary acinus. Different from the research method of single generation with stationary wall, 2D model of the whole pulmonary acinus of 0—8 generations was established based on Weibel-A model. The dynamic mechanism of rhythmic contraction/expansion through moving boundary method was applied to simulating unsteady airflow patterns in human pulmonary acinus under breathing scenarios of sedentary tidal volume breathing. Particles were traced in the Lagrangian frame, and the particle deposition rate and main deposition mechanisms of particle deposition were analyzed. Results show that while Brownian diffusion dominates the transport of small particles(0.01 μm≤dp≤0.50 μm), gravitational sedimentation dominates that of large particles(0.50 μm

参考文献/References

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备注/Memo

备注/Memo:
收稿日期: 2015-06-03. 作者简介: 张鸿雁(1961—),女,教授,zhanghongyan@xauat.edu.cn. 通讯作者: 崔海航,副教授,cuihaihang@xauat.edu.cn.
更新日期/Last Update: 2015-09-17