Streaming and mixing induced by a bundle of ciliary vibrating micro-pillars

Streaming and mixing induced by a bundle of ciliary vibrating micro-pillars Directional near-wall flow induced by the vibration of slender micro-pillars attached to a surface similar to ciliary structures or grafted filaments is studied experimentally. The micro-pillar arrays are arranged in the form of a “V” approximating an asymmetric fore-aft bundle shape often found in nature, too. A base-layer actuation is used to excite the micro-pillars to oscillate in a vibratory pattern with maximum amplitude at the tips. Due to the specific shape of the bundle structure and asymmetric boundary conditions of the oscillatory motion, the pillars perform a tilted beating motion—similar to cilia—with a forward power stroke and a backward oriented recovery stroke or vice versa, depending on the boundary conditions of the actuation. As a consequence of the cooperative beating motion and the fore-aft asymmetry of the shape of the bundle, a directional streaming motion is induced by the pillars which increase with increasing streaming Reynolds number Re S . In addition to the net streaming effect, the flow in the space between the pillar bases exhibit a micro-scale swirling motion around each of the structures with an efficient mixing behavior. Applied to micro-channels or wall-bounded flows, such structures may act as locally distributed passive or active flow manipulation devices. The use of such cilia bundles in large numbers on surfaces as passive structures for near-wall control in of boundary layer flows is feasible, too. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Streaming and mixing induced by a bundle of ciliary vibrating micro-pillars

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Publisher
Springer-Verlag
Copyright
Copyright © 2009 by Springer-Verlag
Subject
Engineering; Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics; Engineering Fluid Dynamics
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-009-0774-7
Publisher site
See Article on Publisher Site

Abstract

Directional near-wall flow induced by the vibration of slender micro-pillars attached to a surface similar to ciliary structures or grafted filaments is studied experimentally. The micro-pillar arrays are arranged in the form of a “V” approximating an asymmetric fore-aft bundle shape often found in nature, too. A base-layer actuation is used to excite the micro-pillars to oscillate in a vibratory pattern with maximum amplitude at the tips. Due to the specific shape of the bundle structure and asymmetric boundary conditions of the oscillatory motion, the pillars perform a tilted beating motion—similar to cilia—with a forward power stroke and a backward oriented recovery stroke or vice versa, depending on the boundary conditions of the actuation. As a consequence of the cooperative beating motion and the fore-aft asymmetry of the shape of the bundle, a directional streaming motion is induced by the pillars which increase with increasing streaming Reynolds number Re S . In addition to the net streaming effect, the flow in the space between the pillar bases exhibit a micro-scale swirling motion around each of the structures with an efficient mixing behavior. Applied to micro-channels or wall-bounded flows, such structures may act as locally distributed passive or active flow manipulation devices. The use of such cilia bundles in large numbers on surfaces as passive structures for near-wall control in of boundary layer flows is feasible, too.

Journal

Experiments in FluidsSpringer Journals

Published: Nov 5, 2009

References

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