Flow rectification in loopy network models of bird lungs
Abstract
We demonstrate flow rectification, valveless pumping or 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 multi-loop 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.
Keywords
Cite
@article{arxiv.2103.11237,
title = {Flow rectification in loopy network models of bird lungs},
author = {Quynh M. Nguyen and Anand U. Oza and Joanna Abouezzi and Guanhua Sun and Stephen Childress and Christina Frederick and Leif Ristroph},
journal= {arXiv preprint arXiv:2103.11237},
year = {2021}
}
Comments
6 pages, 4 figures, 1 supplement information, 3 supplement videos