Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y54: Active Mechanics of Networks and Gels II
11:15 AM–2:15 PM,
Friday, March 9, 2018
LACC Room: 514
Sponsoring Units: GSOFT DBIO
Chair: Itamar Kolvin, Hebrew Univ of Jerusalem
Abstract: Y54.00011 : Insect Respiratory Network-Inspired Microfluidic Devices Act as Hydrodynamic Ratchets*
1:15 PM–1:27 PM
Many entomological respiratory systems appear to be actively ventilated by the periodic buckling of localized sections of the tubes that comprise the tracheal network. These tubes range in diameter from approximately 500 microns at the openings to the respiratory system, depending on the insect, to a fraction of a micron at the distal end of the tracheal system, near the tissue. Often the buckling occurs in a directional manner. We fabricated nine different 3-layer PDMS insect-inspired microfluidic devices to determine if a device that actuates flow in the channel via directional partial collapse of the channel ceiling could produce a unidirectional flow. In all the devices, the flow channel ceiling was collapsed via a symmetric, periodic input forcing signal. We found that many of the designs produced unidirectional flows, and that the flow amount depends on the forcing frequency. Furthermore, we found that the ability to produce a unidirectional flow depends on spatial asymmetries in the hydraulic resistance of the channel. Hence, the successful devices translated a symmetric periodic input forcing into a unidirectional flow, acting as a type of hydrodynamic ratchet.
*This work was partially funded by the NSF under grant EFRI-BSBA 0938047.
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