Flow Rectification in Loopy Network Models of Bird Lungs
Flow Rectification in Loopy Network Models of Bird Lungs
复制标题
鸟肺环路网络模型中的流动校正
DOI：
10.1103/physrevlett.126.114501
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发表时间：
2021
影响因子：
8.6
通讯作者：
Ristroph, Leif
中科院分区：
文献类型：
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作者：
Nguyen, Quynh M.;Oza, Anand U.;Abouezzi, Joanna;Sun, Guanhua;Childress, Stephen;Frederick, Christina;Ristroph, Leif
我们演示了流动整流，无阀泵送，或交流到直流（ac - dc）转换的宏观流体网络与回路。受鸟类肺部独特解剖结构和整个呼吸循环中定向气流现象的启发，我们假设、测试并验证了多环路网络在高雷诺数下受到振荡或交流强迫时表现出持续的循环或直流流动。实验表明，较高频率和振幅的振荡产生了不成比例的强环流，数值模拟证实了这种非线性响应。可视化显示，网络结点处的流动分离和旋涡脱落在振荡周期中以适当的时机起着直流阀的作用。这些发现提出了通过网络拓扑和结连通性来控制惯性流的策略。
We demonstrate flow rectification, valveless pumping, or alternating to direct current (AC-to-DC) conversion in macroscale fluidic networks with loops. Inspired by the unique anatomy of bird lungs and the phenomenon of directed airflow throughout the respiration cycle, we hypothesize, test, and validate that multiloop networks exhibit persistent circulation or DC flows when subject to oscillatory or AC forcing at high Reynolds numbers. Experiments reveal that disproportionately stronger circulation is generated for higher frequencies and amplitudes of the imposed oscillations, and this nonlinear response is corroborated by numerical simulations. Visualizations show that flow separation and vortex shedding at network junctions serve the valving function of directing current with appropriate timing in the oscillation cycle. These findings suggest strategies for controlling inertial flows through network topology and junction connectivity.