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Macroscale fluidic networks with loops can convert alternating to direct current (AC-to-DC) flow, mimicking bird lungs. This valveless pumping effect is stronger at higher frequencies and amplitudes, offering new flow control strategies.

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Area of Science:

  • Fluid Dynamics
  • Biomimetic Engineering
  • Network Science

Background:

  • Bird lungs exhibit efficient, unidirectional airflow.
  • Macroscale fluidic networks typically require active valves for flow control.

Purpose of the Study:

  • To demonstrate flow rectification in macroscale fluidic networks using loops.
  • To investigate the biomimetic potential of multiloop networks for AC-to-DC flow conversion.

Main Methods:

  • Experimental testing of macroscale fluidic networks with multiloop topologies.
  • Numerical simulations to corroborate experimental findings.
  • Flow visualization techniques to analyze fluid behavior at junctions.

Main Results:

  • Multiloop networks generate persistent circulation (DC flow) under oscillatory (AC) forcing at high Reynolds numbers.
  • Flow rectification efficiency increases with higher frequencies and amplitudes of oscillation.
  • Flow separation and vortex shedding at junctions act as passive valving mechanisms.

Conclusions:

  • Network topology and junction connectivity can control inertial flows.
  • Biomimetic multiloop designs offer a valveless approach to AC-to-DC flow conversion.
  • Findings suggest novel strategies for passive fluid flow management in macroscale systems.