氧气输送系统的流动和浓度场的数值模拟

Numerical simulation of the flow and concentration fields for oxygen delivery systems.

作者信息

Hangan H, Bekele S

机构信息

Boundary Layer Wind Tunnel Laboratory, University of Western Ontario, London, Ontario, Canada.

出版信息

J Biomech Eng. 2003 Oct;125(5):648-62. doi: 10.1115/1.1613296.

DOI:10.1115/1.1613296

PMID:14618924

Abstract

The flow and concentration fields for various medical oxygen delivery devices are numerically investigated. Simulations are performed for a classical Venturi mask and two new OxyArm portable devices. The velocity and oxygen concentration fields are investigated for: (i) a constant (steady-state) inhalation and (ii) a complete respiratory cycle (unsteady). The numerical results are qualitatively compared with clinical trials. It is found that the optimal functioning of these medical devices implies a balance between oxygen delivery by advection and the mixing process that allows for reliable CO2 monitoring (capnographic capability). Also, at the typical scales associated with these devices the flow is found to be Reynolds number dependent.

摘要

对各种医用输氧设备的流场和浓度场进行了数值研究。对经典文丘里面罩和两种新型OxyArm便携式设备进行了模拟。研究了以下两种情况下的速度场和氧气浓度场：(i) 恒定（稳态）吸入；(ii) 完整呼吸周期（非稳态）。将数值结果与临床试验进行了定性比较。结果发现，这些医疗设备的最佳功能意味着平流输氧与允许可靠监测二氧化碳（二氧化碳图能力）的混合过程之间的平衡。此外，在与这些设备相关的典型尺度下，发现流动与雷诺数有关。