Fluid Dynamics in Airway Bifurcations: II. Secondary Currents
Fluid Dynamics in Airway Bifurcations: II. Secondary Currents
复制标题
气道分叉处的流体动力学：II。
作者：
T. Martonen;X. Guan;R. Schreck
作为本期刊报道的分叉流系统研究的第二个组成部分，这项工作的重点是二次流。第一篇文章讨论了主要流动，第三篇文章讨论了局部条件（均在本期中）。使用 FIDAP 和 Cray T90 超级计算机在两个肺分叉模型 (Schreck, 1972) 中研究了二次流动模式。在距隆突远端不同规定距离处检查电流。讨论了入口条件、雷诺数、直径比和气道方向的影响。由隆突的存在和子管的倾斜引起的次级电流表现出对称的多涡流模式。雷诺数越大，分叉角越大，二次电流的强度就越强。
As the second component of a systematic investigation on flows in bifurcations reported in this journal, this work focused on secondary currents. The first article addressed primary flows and the third discusses localized conditions (both in this issue). Secondary flow patterns were studied in two lung bifurcation models (Schreck, 1972) using FIDAP with the Cray T90 supercomputer. The currents were examined at different prescribed distances distal to the carina. Effects of inlet conditions, Reynolds numbers, and diameter ratios and orientations of airways were addressed. The secondary currents caused by the presence of the carina and inclination of the daughter tubes exhibited symmetric, multivortex patterns. The intensities of the secondary currents became stronger for larger Reynolds numbers and larger angles of bifurcation.